examples11

id: 10649

question: Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

choice: (A) The magnitude of the magnetic force is the same in both pairs. (B) The magnitude of the magnetic force is smaller in Pair 1. (C) The magnitude of the magnetic force is smaller in Pair 2.

context: The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material, but some of them are different shapes.

answer: A

Rationale:

0: Magnets can pull or push on each other without touching.
1: When magnets attract, they pull together.
2: When magnets repel, they push apart.
3: These pulls and pushes between magnets are called magnetic forces.
4: The strength of a force is called its magnitude.
5: The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
6: You can change the magnitude of a magnetic force between two magnets by changing the distance between them.
7: The magnitude of the magnetic force is smaller when there is a greater distance between the magnets.
8: Distance affects the magnitude of the magnetic force.
9: When there is a greater distance between magnets, the magnitude of the magnetic force between them is smaller.
10: There is a greater distance between the magnets in Pair 2 than in Pair 1.
11: So, the magnitude of the magnetic force is smaller in Pair 2 than in Pair 1.
12: The answer is C.

generated_skill:

solution: Both magnet sizes and distance affect the magnitude of the magnetic force. The sizes of the magnets in Pair 1 are the same as in Pair 2. The distance between the magnets is also the same. So, the magnitude of the magnetic force is the same in both pairs.

skill: Compare magnitudes of magnetic forces

id: 10661

lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes. The magnitude of the magnetic force is smaller when the magnets are smaller.

question: Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

choice: (A) The magnitude of the magnetic force is the same in both pairs. (B) The magnitude of the magnetic force is smaller in Pair 2. (C) The magnitude of the magnetic force is smaller in Pair 1.

answer: C

Rationale:

0: Magnets can pull or push on each other without touching.
1: When magnets attract, they pull together.
2: When magnets repel, they push apart.
3: These pulls and pushes between magnets are called magnetic forces.
4: The strength of a force is called its magnitude.
5: The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
6: You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes.
7: The magnitude of the magnetic force is smaller when the magnets are smaller.
8: The magnets in Pair 2 attract.
9: The magnets in Pair 1 repel.
10: But whether the magnets attract or repel affects only the direction of the magnetic force.
11: It does not affect the magnitude of the magnetic force.
12: Magnet sizes affect the magnitude of the magnetic force.
13: Imagine magnets that are the same shape and made of the same material.
14: The smaller the magnets, the smaller the magnitude of the magnetic force between them.
15: Magnet A is the same size in both pairs.
16: But Magnet B is smaller in Pair 2 than in Pair 1.
17: So, the magnitude of the magnetic force is smaller in Pair 2 than in Pair 1.
18: The answer is B.

generated_skill:

solution: The magnets in Pair 2 attract. The magnets in Pair 1 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The smaller the magnets, the smaller the magnitude of the magnetic force between them. Magnet A is the same size in both pairs. But Magnet B is smaller in Pair 1 than in Pair 2. So, the magnitude of the magnetic force is smaller in Pair 1 than in Pair 2.

skill: Compare magnitudes of magnetic forces

id: 10685

lecture: A material is a type of matter. Wood, glass, metal, and plastic are common materials. Some objects are made of just one material. Most nails are made of metal. Other objects are made of more than one material. This hammer is made of metal and wood.

question: Which material is this toilet plunger made of?

choice: (A) wood (B) porcelain

context: N/A

answer: A

Rationale:

0: A material is a type of matter.
1: Wood, glass, metal, and plastic are common materials.
2: Some objects are made of just one material.
3: Most nails are made of metal.
4: Other objects are made of more than one material.
5: This hammer is made of metal and wood.
6: Look at the picture of the toilet plunger.
7: The toilet plunger is made of two different materials.
8: The handle is made of wood, and the head is made of porcelain.
9: Porcelain is a very hard material.
10: It does not break easily.
11: The answer is B.

generated_skill:

solution: Look at the picture of the toilet plunger. The toilet plunger is made of two different materials. The handle is made of wood, and the head is made of rubber. Rubber is a good material for a toilet plunger because it is flexible. The plunger can bend to the shape of the toilet.

skill: Identify multiple materials in objects

id: 10709

lecture: A food web is a model. A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web shows how some organisms in an ecosystem can get their food. Arrows show how matter moves. A food web has arrows that point from one organism to another. Each arrow shows the direction that matter moves when one organism eats another organism. An arrow starts from the organism that is eaten. The arrow points to the organism that is doing the eating. An organism in a food web can have more than one arrow pointing from it. This shows that the organism is eaten by more than one other organism in the food web. An organism in a food web can also have more than one arrow pointing to it. This shows that the organism eats more than one other organism in the food web.

question: In this food web, which organism contains matter that eventually moves to the earthworm?

choice: (A) barren-ground caribou (B) mushroom (C) grizzly bear (D) bear sedge

context: Below is a food web from a tundra ecosystem in Nunavut, a territory in Northern Canada. A food web models how the matter eaten by organisms moves through an ecosystem. The arrows in a food web represent how matter moves between organisms in an ecosystem.

answer: D

Rationale:

0: A food web is a model.
1: A food web shows where organisms in an ecosystem get their food.
2: Models can make things in nature easier to understand because models can represent complex things in a simpler way.
3: If a food web showed every organism in an ecosystem, the food web would be hard to understand.
4: So, each food web shows how some organisms in an ecosystem can get their food.
5: Arrows show how matter moves.
6: A food web has arrows that point from one organism to another.
7: Each arrow shows the direction that matter moves when one organism eats another organism.
8: An arrow starts from the organism that is eaten.
9: The arrow points to the organism that is doing the eating.
10: An organism in a food web can have more than one arrow pointing from it.
11: This shows that the organism is eaten by more than one other organism in the food web.
12: An organism in a food web can also have more than one arrow pointing to it.
13: This shows that the organism eats more than one other organism in the food web.
14: Use the arrows to follow how matter moves through this food web.
15: For each answer choice, try to find a path of arrows to the earthworm.
16: The only arrow pointing from the grizzly bear leads to the mushroom.
17: No arrows point from the mushroom to any other organisms.
18: So, in this food web, matter does not move from the grizzly bear to the earthworm.
19: There are two arrows pointing from the barren-ground caribou to other organisms.
20: One arrow points to the grizzly bear.
21: The only arrow pointing from the grizzly bear leads to the mushroom.
22: The other arrow pointing from the barren-ground caribou leads to the mushroom.
23: No arrows point from the mushroom to any other organisms.
24: So, in this food web, matter does not move from the barren-ground caribou to the earthworm.There is one path matter can take from the lichen to the earthworm: lichen->barren-ground caribou->earthworm.
25: bear sedge.
26: The bear sedge does not have any arrows pointing from it to any other organisms.
27: So, in this food web, matter does not move from the bear sedge to the earthworm..
28: The answer is B.

generated_skill:

solution: Use the arrows to follow how matter moves through this food web. For each answer choice, try to find a path of arrows to the earthworm. The only arrow pointing from the grizzly bear leads to the mushroom. No arrows point from the mushroom to any other organisms. So, in this food web, matter does not move from the grizzly bear to the earthworm.There are three paths matter can take from the bear sedge to the earthworm: bear sedge->brown lemming->Arctic fox->earthworm. bear sedge->brown lemming->snowy owl->earthworm. bear sedge->brown lemming->parasitic jaeger->rough-legged hawk->earthworm. mushroom. No arrows point from the mushroom to any other organisms. So, in this food web, matter does not move from the mushroom to the earthworm.. barren-ground caribou. There are two arrows pointing from the barren-ground caribou to other organisms. One arrow points to the grizzly bear. The only arrow pointing from the grizzly bear leads to the mushroom. The other arrow pointing from the barren-ground caribou leads to the mushroom. No arrows point from the mushroom to any other organisms. So, in this food web, matter does not move from the barren-ground caribou to the earthworm.. There are four paths matter can take from the bilberry to the earthworm: bilberry->Arctic fox->earthworm. bilberry->brown lemming->Arctic fox->earthworm. bilberry->brown lemming->snowy owl->earthworm. bilberry->brown lemming->parasitic jaeger->rough-legged hawk->earthworm.

skill: Interpret food webs II

id: 10883

lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is weaker when the magnets are farther apart.

question: Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

choice: (A) The magnetic force is weaker in Pair 2. (B) The strength of the magnetic force is the same in both pairs. (C) The magnetic force is weaker in Pair 1.

context: The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material.

answer: A

Rationale:

0: Magnets can pull or push on each other without touching.
1: When magnets attract, they pull together.
2: When magnets repel, they push apart.
3: These pulls and pushes between magnets are called magnetic forces.
4: The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
5: You can change the strength of a magnetic force between two magnets by changing the distance between them.
6: The magnetic force is weaker when the magnets are farther apart.
7: Distance affects the strength of the magnetic force.
8: When magnets are farther apart, the magnetic force between them is weaker.
9: The magnets in Pair 1 are farther apart than the magnets in Pair 2.
10: So, the magnetic force is weaker in Pair 1 than in Pair 2.
11: The answer is C.

generated_skill:

solution: Distance affects the strength of the magnetic force. When magnets are farther apart, the magnetic force between them is weaker. The magnets in Pair 2 are farther apart than the magnets in Pair 1. So, the magnetic force is weaker in Pair 2 than in Pair 1.

skill: Compare strengths of magnetic forces

id: 11073

lecture: An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification.

question: Which property do these three objects have in common?

choice: (A) translucent (B) transparent (C) sour

context: Select the best answer.

answer: C

Rationale:

0: An object has different properties.
1: A property of an object can tell you how it looks, feels, tastes, or smells.
2: Properties can also tell you how an object will behave when something happens to it.
3: Different objects can have properties in common.
4: You can use these properties to put objects into groups.
5: Grouping objects by their properties is called classification.
6: Look at each object.
7: For each object, decide if it has that property.
8: A lemon has a sour taste.
9: The ocean water and the green apple are not sour.
10: You can see clearly through a transparent object.
11: The ocean water is transparent, but the green apple and the carrot are not.
12: A translucent object lets light through.
13: But you cannot see clearly through a translucent object.
14: All three objects are translucent.
15: The property that all three objects have in common is translucent.
16: The answer is A.

generated_skill:

solution: Look at each object. For each object, decide if it has that property. A translucent object lets light through. But you cannot see clearly through a translucent object. The green apple is not translucent. You can see clearly through a transparent object. The green apple and the lime are not transparent. A lemon has a sour taste. All three objects are sour. The property that all three objects have in common is sour.

skill: Compare properties of objects

id: 11083

lecture:

question: Which state is highlighted?

choice: (A) Washington (B) New Mexico (C) California (D) Alaska

context: N/A

answer: B

Rationale:

0: This state is Colorado.
1: The answer is A.

generated_skill:

solution: This state is New Mexico.

skill: Identify the 50 states

id: 11113

question: Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

choice: (A) The magnitude of the magnetic force is greater in Pair 2. (B) The magnitude of the magnetic force is greater in Pair 1. (C) The magnitude of the magnetic force is the same in both pairs.

answer: A

Rationale:

0: Magnets can pull or push on each other without touching.
1: When magnets attract, they pull together.
2: When magnets repel, they push apart.
3: These pulls and pushes between magnets are called magnetic forces.
4: The strength of a force is called its magnitude.
5: The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
6: You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes.
7: The magnitude of the magnetic force is greater when the magnets are larger.
8: The magnets in Pair 2 attract.
9: The magnets in Pair 1 repel.
10: But whether the magnets attract or repel affects only the direction of the magnetic force.
11: It does not affect the magnitude of the magnetic force.
12: Magnet sizes affect the magnitude of the magnetic force.
13: Imagine magnets that are the same shape and made of the same material.
14: The larger the magnets, the greater the magnitude of the magnetic force between them.
15: Magnet A is the same size in both pairs.
16: But Magnet B is larger in Pair 1 than in Pair 2.
17: So, the magnitude of the magnetic force is greater in Pair 1 than in Pair 2.
18: The answer is B.

generated_skill:

solution: Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The larger the magnets, the greater the magnitude of the magnetic force between them. Magnet A is the same size in both pairs. But Magnet B is larger in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1.

skill: Compare magnitudes of magnetic forces

id: 11123

lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.

question: Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

choice: (A) The magnetic force is weaker in Pair 2. (B) The strength of the magnetic force is the same in both pairs. (C) The magnetic force is weaker in Pair 1.

context: The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material.

answer: B

Rationale:

0: Magnets can pull or push on each other without touching.
1: When magnets attract, they pull together.
2: When magnets repel, they push apart.
3: These pulls and pushes between magnets are called magnetic forces.
4: The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
5: You can change the strength of a magnetic force between two magnets by changing the distance between them.
6: The magnetic force is weaker when the magnets are farther apart.
7: Distance affects the strength of the magnetic force.
8: When magnets are farther apart, the magnetic force between them is weaker.
9: The magnets in Pair 1 are farther apart than the magnets in Pair 2.
10: So, the magnetic force is weaker in Pair 1 than in Pair 2.
11: The answer is C.

generated_skill:

solution: Distance affects the strength of the magnetic force. But the distance between the magnets in Pair 1 and in Pair 2 is the same. So, the strength of the magnetic force is the same in both pairs.

skill: Compare strengths of magnetic forces

id: 11145

lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.

question: Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

choice: (A) The strength of the magnetic force is the same in both pairs. (B) The magnetic force is weaker in Pair 1. (C) The magnetic force is weaker in Pair 2.

context: The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material.

answer: A

Rationale:

0: Magnets can pull or push on each other without touching.
1: When magnets attract, they pull together.
2: When magnets repel, they push apart.
3: These pulls and pushes between magnets are called magnetic forces.
4: The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
5: You can change the strength of a magnetic force between two magnets by changing the distance between them.
6: The magnetic force is weaker when the magnets are farther apart.
7: Distance affects the strength of the magnetic force.
8: When magnets are farther apart, the magnetic force between them is weaker.
9: The magnets in Pair 2 are farther apart than the magnets in Pair 1.
10: So, the magnetic force is weaker in Pair 2 than in Pair 1.
11: The answer is C.

generated_skill:

skill: Compare strengths of magnetic forces