Energy and Motion Review

The change in speed of an object is due to...

• an outside force acting upon it.

• a change in temperature.

• the wind blowing.

• a change in the mass of the object.

Choose the surface that will produce the LEAST amount of friction.

• wood

• ice

• carpet

• concrete

As Carl pushes the dresser up the ramp, both the forces of gravity and ________________ are working against him.

If two people pull on opposite ends of a rope with the same amount of force...

• the rope will sag in the middle.

• one person will be pulled forward and the other will fall backward.

• the rope will break.

• both people will stay in the same position.

Choose all the NON-CONTACT forces.

• magnetism

• push

• gravity

• pull

Choose all the CONTACT forces.

• pull

• gravity

• push

• friction

Sammy wants to experiment to see what will happen if a moving ball collides with a non-moving ball. He sets up two balls on the pool table and rolls Ball 1 into Ball 2 across the table. When they collide, Ball 1 stops moving and Ball 2 moves forward.

Choose the statement that best describes what happened to Ball 2.

• The energy from Ball 1 was transferred into Ball 2.

• Friction caused Ball 1 to stop moving.

• Ball 2 acted like a magnet, attracting Ball 1.

• Ball 1 lost its energy.

A ball with more mass will require ____________ force to move across the floor quickly, than a ball with less mass.

• more

• less

Scientists perform experiments to test their hypotheses. When performing experiments, it is important to have accurate results. What is the best way to make sure that the results are the most accurate?

• Perform the test one time and record those results.

• Guess the results and write it down.

• Forget to write down any information.

• Repeat the experiment multiple times and record each result.

Two arrows were both shot straight at a tree at the same time. One arrow stuck deep into the tree. The other arrow tapped the tree and bounced off.

Choose the words that would best complete this sentence.

The arrow that bounced off the tree had less _________ than the arrow that stuck into the tree.

• speed

• weight

• energy

• matter