All About Forces

What is a force? Check all the correct answers.

• It is a pull or a push.

• It can change an object's position or put it in motion.

• It can slow down objects and make them stop.

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What is a contact force?

• It is a force that can only act between objects that are touching.

• It is a force that can act between objects at a distance.

• It is a force that does not exist between objects.

Which of the pictures below shows a contact force? Check all correct answers.

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Which picture below shows a noncontact force?

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What is friction?

• It is the force that pulls objects towards the center of Earth.

• It is the force that occurs when two objects rub against each other.

• It is the force of attraction between certain materials.

Which picture below is an example of friction?

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Why is it harder for the boy in picture B to get down the hill?

• In picture B, the grass is smooth and so there is less friction taking place between the boy and the grass.

• In picture B, the grass is rough and so there is more friction taking place between the boy and the grass.

How does friction help us move from place to place?

• Friction does not help us.

• Friction makes us slip and fall.

• Friction keeps us from slipping and sliding.

What is air resistance?

• It is the force that pulls objects towards the center of Earth.

• It is the force that occurs when two objects rub against each other.

• It is the force that acts on moving objects in the air.

Which force is taking place in this picture that slows down the skydiver?

• Gravity

• Air resistance

• Magnetism