Energy Test Review

Potential Energy

Kinetic Energy

Velocity

1. In the diagram below, the baseball is being released by the

pitcher (position A), traveling toward the batter (position B), and stopping in the catcher’s glove (position C). At which

position would the baseball have the most kinetic energy?

Answer B, Why?In motion at this point

2. When the rubber band was stretched, what type of energy did it contain?

 

Answer: Potential Energy

3. As the rubber band was released and snapped

back, it changed to _______ energy.

Answer: Kinetic

4. Turning on a light is what type of energy transformation?

Answer: electric to light

5. What energy transformation occurs

when you strike a match on the rough strip of a

matchbook cover?

Answer: Mechanical to Heat (thermal)

6. The burning match involves the

transformation of

Answer: chemical energy to light and heat (thermal) energy

7. What type of energy is contained in the matches

within a matchbook?

Chemical potential energy

8. Near earth’s surface, an object’s gravitational potential energy is

determined by the formula PE = mgh. What does the

g in the formula represent?

g =acceleration due to gravity or

10 m/s2

9. An object’s gravitational kinetic energy is determined by the formula KE = ½ mv2, where v represents the velocity of the

object. If the velocity of a thrown object were to increase,

what would happen to the kinetic energy of the object? Increases

10. Complete the following chart by putting in the energy needed (input) and the energy given off (output). Put your answers on

the answer document-not on the table .

Item Energy input Energy output

Toaster

Fan

Telephone

Gasoline Chainsaw

Natural gas stove

In doing the following inclined plane experiment in “ideal conditions,” assume that friction from

the air, incline or floor is negligible. A stationary box at the top of a frictionless incline is released and is allowed to slide to the bottom. The figure

below illustrates the box in four positions labeled A through D as it is sliding from the

incline onto the level floor. As the box moves from the bottom of the incline to the floor,

assume that the box experiences no change in

speed, only a change in direction.

11. At what time does the box have the

greatest kinetic energy?

12. Where is the potential energy of the box greatest?

A, Why?

14.  When a space shuttle is launched, it continues to accelerate for several minutes. Which graph shows the kinetic energy of the space shuttle during the first few minutes of flight? (Launch time = 0) 

Calculation Problems

These problems must have work to show how you got the answers. Start with the formula then plug in

the values.

A marble with a mass of 0.01 kg is released to travel through a track that was 2.00 meters long. It takes the marble 0.930 seconds to travel the length of the track.

What is the velocity?  

 Velocity = distance/time

What is distance?

2.00 m

What is time?

0.930 s

V = (2.00 m) /(0.930 s) = _____ m/s

Calculate the approximate gravitational potential energy of a 70.0-kg skier

when he is at the top of a 30.0 meter hill.

PE = mass x g x height

Mass?

M = 70.0 kg

g = ?

Acceleration due to gravity = 10 m/s2

Height = ?

H = 30.0 m

PE = (70.0 kg) x (10 m/s2) x (30.0 m) = __ J

Calculate the kinetic energy of a 0.50-kg

marble on a 3.0-m track if the velocity is 3.5 m/s.

KE = ½ mass x velocity 2

Mass = 0.50 kg

Velocity = 3.5 m/s

KE = ½ x (0.50 kg) x (3.5 m/s)2 = ____ J

Short Answer

These should be answered with complete sentences.

State the law of conservation of energy. Matter cannot be created nor destroyed; however, it can be transferred.

State the using complete sentences three

disadvantages and three advantages to renewable

energy sources. You may pick a renewable energy

Solar

Wind

Water

Draw a diagram showing the circuit of energy in a DC circuit powered by a 1.5 volt battery

and contains one switch and one resistor (light bulb). Show the

direction of the flow of the electrons. +

BA T T ER Y-

Light

switch

Flow of electrons is from the negative battery terminal through the light then switch then back to the positive end of the battery terminal.