4.14 Force and Motion Review

Pictures on the wall is hung by tape. The pictures was found on the ground. Which force acted upon the picture, causing it to fall?

• gravity

• friction

• magnetism

• evaporation

A student wants to see how the size of an iron ball is affected by gravity. Which of the following would have to remain the same for the experiment to be successful?

• volume and material used

• mass and volume

• material used and shape of object

A push or pull that can change the position or motion of an object/material is --

• magnetism

• motion

• force

If you roll a toy car on different types of material. What are you testing by rolling the car on foil, felt, or carpeted material?

• gravity

• gravity and magnetism

• magnetism and friction

• friction

Friction is the _________

• force of attraction that causes a magnetic material to move

• force that acts in an opposite directions to movement

• act of applying force in order to move something away

Which force most likely causes the skateboarder to skate down the halfpipe ramp over and over again?

• pushing

• magnetism

• friction

• gravity

Why do we need friction?

• It helps objects go faster. 
• It helps objects go up higher.
• It helps make objects go slower or stop.