Energy Test Review Potential Energy Kinetic Energy Velocity

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/s 2

9. An object’s gravitational kinetic energy is determined by the formula KE = ½ mv 2, 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 Item the answer document-not on the table . Toaster Fan Telephone Gasoline Chainsaw Natural gas stove Energy input Energy output

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?

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) A, Why?

Calculation Problems These problems must have work to show 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/s 2 Height = ? H = 30. 0 m PE = (70. 0 kg) x (10 m/s 2) 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. + B A T T E R Y - Flow of electrons is from the negative battery terminal through the light then switch then back to the positive end of the battery terminal. Light switch