Energy and Motion

Which is the best example that something has kinetic energy?

• a. a car parked on a steep hill 
• b. a tennis ball rolling across the court
• c. a picture hanging on the wall 
• d. a piece of coal before it's burned 

Which point has the most potential energy?

• D
• F
• B
• A

^{Which point has the greatest kinetic energy?}

• W
• X
• Y
• Z

What is happening to the energy of the girl from point A to point B

• kinetic changes to potential
• potential changes to kinetic
• energy is lost
• energy is gained

The law of conservation of energy means ________________________

• Energy CAN be created and destroyed or transformed
• Energy can be used up or transformed
• Energy CANNOT be created or destroyed, only transformed
• Energy cannot be transformed

True or False: an object will accelerate if there are unbalanced forces acting on it?

• True

• False

Fill in the blanks: A student is comparing characteristics of three toy cars. A student notices that as the __________ increases, the kinetic energy of the car ___________

• speed; decreases

• mass; decreases

• mass; increases

• speed; increases

At which position will a ball have the least amount of POTENTIAL energy?

• 1 because it has the furthest to fall

• 3 because it is closest to the ground

• 3 because it is moving the fastest

• 1 because it is moving the fastest

The student rolls a ball down the ramp and makes the following claim: As the ball travels down the ramp, the kinetic energy increases and the potential energy stays the same. Explain why they are correct or incorrect.

• The claim is incorrect because the potential energy increases when the speed of the ball increases.

• The claim is incorrect because the potential energy of the ball is being transferred to kinetic energy as it travels down the ramp.

• The claim is correct because the speed of the ball increases, causing the ball to remain in motion as it travels beyond the ramp.

• The claim is correct because the speed of the ball is the same as its kinetic energy, and the speed of the ball increases as it travels down the ramp.

A student adds material to the ramp that causes less friction. When the ball rolls down the ramp, the speed of the ball _____________. 

• stay the same

• increase

• decrease

• we cannot tell with only this information