Forces Cause Change

Laura can use a toy car to demonstrate the force of gravity by doing which of these?

• Letting the toy car roll down a ramp

• Placing the toy car on the floor

• Lifting the toy car onto a shelf

• Pushing the toy car across a table

Gabriel wants to demonstrate gravity acting on falling objects. Which of the following would be an example of this?

• He rolls a ball down a slide.

• He places a block on the floor.

• He lifts a boot up to a high shelf.

• He pulls a wagon along the sidewalk.

A wagon is resting on the floor, about a meter away from a traffic cone.

Which of the following will move the wagon toward the cone?

• Pushing at point X

• Pulling at point X

• Pushing at point Y

• Pulling at point Y

Sadie rolls a marble down a ramp. When the marble reaches the bottom of the ramp, it then rolls across the floor. After a few seconds, the marble slows down, then stops. What caused the marble to stop?

• Friction between the marble and the floor

• Air pressure pushing down the marble

• The force of gravity pulling the marble down

• Magnetic attraction between Earth and the marble

Frank pushed two balls of different mass with the same force.

How will the motion of the ball with greater mass be different from the motion of the ball with less mass?

• The ball with greater mass will move across a shorter distance.

• The ball with greater mass will move in a different direction.

• The ball with greater mass will roll for a longer amount of time.

• The ball with greater mass will move with the more speed.

Ross is at the bowling alley. These are the four different bowling balls he can choose from.

If Ross throws each of the balls with the same force, this force will most likely have the greatest effect on which ball?

• Ball A

• Ball B

• Ball C

• Ball D

Valerie is asked by her teacher to show the force of gravity with a toy car. How can Valerie use a toy car to demonstrate the force of gravity?

• Let the toy car roll down a ramp

• Place the toy car on the floor

• Lift the toy car onto a shelf

• Push the toy car across a table

Zach, Beth, Randall, and Keisha are experimenting with forces. They each have a ball of the same mass and are going to move the balls on the same surface. The illustration shows their experimental setup.

The four students noticed that the balls rolled different distances. Which best explains why this happened?

• The balls experienced different amounts of friction.

• The balls did not all roll in the same direction.

• The balls were pushed with different amounts of force.

• The balls were not all pushed at the same time.