Unit 8.1 Quiz 5

How would the amount of force on the head compare to the amount of force on the object it collides with in each system A, B, and C?

• In every collision, the peak force on the head would be different than the peak force on the other object in the collision.

• In some, but not all, collisions the peak force on the head would be the same as the peak force on the other object in the collision.

• In every collision, the peak force on the head would be the same as the peak force on the other object in the collision.

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In the previous question, you were asked, "How would the amount of force on the head compare to the amount of force on the object it collides with in each system A, B, and C?"

Explain your answer to that question.

• The forces would only be equal in system B, because the two objects in the collision are the same.

• The force on the ground in system C would be greater than the force on the head because the grass is soft and not moving, but the force on the head in System A and B would be equal to the force of the other object in the collision because in both systems the objects are moving.

• In each scenario, the forces on the head would be equal to the force on the object it collides with because forces come in equal and opposite pairs.

• Since the objects in the collision with the head are all different, the force and the head would be different than the force on the other objects.

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Considering both objects that are about to collide in each interaction, which system would have the least amount of kinetic energy in the system right before a collision? Assume that player #84 is moving at 7 m/s.

• Player #84 running and heading the soccer ball that was kicked by another player.

• Player #84 running and colliding with another running player running towards them.

• Player #84 running and hitting the ground.

• All the situations have the same amount of kinetic energy.

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In the previous question you were asked which system would have the least amount of kinetic energy right before a collision.

Explain your answer to the previous question:

• The player is not moving as fast as the ball.

• The players can’t run that fast.

• The ground is not moving.

• The amount of kinetic energy is always the same.

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Force is needed:

• to prevent a moving object from turning.

• for a motionless object to remain still.

• for a moving object to keep moving at the same speed and direction.

• for a moving object to change its speed.

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A fan cart is moving forward on a frictionless surface. If you change the fan speed from High to Low, what will occur?

• The cart will keep moving at the same speed.

• The cart will slow down.

• The cart will stop moving.

• The cart will continue to speed up, but not as quickly as before.

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The speed-versus-time bar graph for a fan cart experiment is shown. What could have happened?

• The track was frictionless, and the fan was changed from High to Low after 8 seconds.

• The track was frictionless, and the fan was changed from High to Off after 8 seconds.

• The track was wooden, and the fan was changed from High to Off after 8 seconds.

• The track was wooden, and the fan was changed from Off to Low after 8 seconds.

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What causes objects to change their motion?

• a net force

• an equal and opposite force

• potential energy

• kinetic energy

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