Semester 1 Review 2023

a force is best defined as ---

• the application of weight

• a push or pull that is exerted on matter

• the flow of electric charges

• a bond in which electrons are shared

A student pushes against a wall with 20 N of force and the wall does not move. In this situation, the wall exerts --

• 0 N of force

• less than 20 N of force

• 20 N of force

• more than 20 N of force

The diagram below show the forces acting on a soccer ball.

In which of the diagrams will the ball remain motionless?

• W

• X

• Y

• Z

In the diagram below, a girl sits on a sled and slides down a hill of snow. Which arrow represents the force of friction opposing the motion of the sled down the hill?

• Arrow A

• Arrow B

• Arrow C

• Arrow D

A volley ball player hits a ball. A free body diagram for this system would look like...

• Diagram A

• Diagram B

• Diagram C

• Diagram D

Answer explanation

A free body diagram shows each subsystem in the collision and the forces acting on that subsystem.

The force arrow should point to where the object is being pushed on by the other subsystem.

The forces in a collision are equal in strength and opposite in direction.

Changes in motion during a collision are caused by...

• transfer of kinetic energy.

• forces between objects.

Changes in shape during a collision are caused by...

• transfer of kinetic energy.

• forces between objects.

Peak force is...

• The maximum amount of force that can be applied to an object before it permanently deforms.

• The maximum amount of deformation that an object can experience before it breaks.

• The largest amount of force an object experiences during a collision.

• The largest amount of force an object can experience and only deform temporarily.

When the speed of one or more objects in a collision increases...

• The peak force in the collision decreases.

• The peak force in a collision increases.

• The kinetic energy in the system decreases.

• The kinetic energy in the system increases.

When the mass of one or more objects in a collision increases...

• The peak force on the heavier object is greater.

• The peak force on the lighter object is greater.

• The peak force on both objects is less, but still equal.

• The peak force on both objects is greater but still equal.