PE & KE Review

Ansley was drying her hair with her new blow dryer while getting ready for school in the morning.  According to the law of conservation of energy, if the dryer produced 30 joules of electrical energy and it was converted to sound and heat, how much of the energy will be permanently lost?  

(HINT: The joule is a unit for measuring energy.)

• 15 Joules

   

• 0 Joules

• 30 Joules

• 10 Joules

Which point represents minimum potential energy?

• W

• X

• Y

• Z

Which number shows the ball with a little less kinetic energy than 2

• 4

• 5

• 3

• 1

As you go up a hill…

• Potential energy increases and kinetic energy decreases 

• Potential energy will remain constant

• Kinetic energy increases and potential energy decreases

• Kinetic energy will remain constant

Which number shows the ball with the least potential energy? 

• 4

• 5

• 3

• 1

Explain what happens to the potential and kinetic energy of the cart as it moves from Point P to Point Q. 

• Cart begins at point a with 0 kinetic energy and all potential energy, as the car goes down the hill toward point P, potential energy is transformed into kinetic energy.

• Cart begins at point a with all kinetic energy and 0 potential energy, as the car goes down the hill toward point Q, potential energy is transformed into Kinetic energy.

• Cart begins at point a with 0 kinetic energy and all potential energy, as the car goes down the hill toward point Q, Kinetic energy is transformed into Potential energy.

• Cart begins at point a with 0 kinetic energy and all potential energy, as the car goes down the hill toward point Q, potential energy is transformed into kinetic energy.

As Ashton crosses the finish line to be the first place winner at the Peachtree Road Race, what type 

of energy transformation occurred?

• potential energy transferred to kinetic energy

• potential energy will remain constant

• kinetic energy transferred to potential energy

• Kinetic energy will remain constant

Which point represents maximum potential energy? 

• W

• X

• Y

• Z

Which point represents maximum kinetic energy? 

• W

• X

• Y

• Z

Look at the picture to the left, what type of energy transformation occurred as the marble rolled from the top of the ramp to the bottom of the ramp?

• potential energy transferred to kinetic energy

• potential energy will remain constant

• kinetic energy transferred to potential energy

• kinetic energy will remain constant