Motion and Force

To make an object move you must first apply ---

• an opposing force

• an unbalanced force

• a stationary force

• a vertical force

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

Ana pushed on a big rock in her back yard. She was unable to get it to move because she did not -

• apply enough force

• have a good grip on the rock

• have enough mass

• weigh enough

Many bicycles use a hand brake to control their speed. When the brake is engaged, a rubber pad presses against the tire. What force of motion does the hand brake rely upon to slow the bicycle?

• Gravity

• Friction

• Electricity

• Magnetism

This game of tug of war is an example of _________ forces.

• unbalanced

• balanced

• potential

• net zero

What will the net force on the soccer ball be?

• 50 N to the left

• 50 N to the right

• 200 N to the left

• 200 N to the right

What is the net force on the car?

• 400 N forward (left)

• 0 N (balanced forces)

• 200 N forward (left)

• 200 N backward (right)