Download Energy Test Study Guide

Energy Test: Study Guide (Applied Physics)
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. When a car’s speed triples, its kinetic energy
a. remains the same.
b. triples.
c. increases by four times.
d. increases by nine times.
____
2. How much farther will a car traveling at 100 km/s skid than the same car traveling at 50 km/s?
a. Half as far.
b. The same distance.
c. Twice as far.
d. Four times as far.
____
3. An object at rest may have
a. energy.
b. speed.
c. velocity.
d. momentum.
____
4. Energy is changed from one form to another with no net loss or gain.
a. Sometimes true
b. Always false
c. Always true
____
5. A ball is thrown into the air with 100 J of kinetic energy, which is transformed to gravitational potential
energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its
kinetic energy is
a. 100 J.
b. more than 100 J.
c. less than 100 J.
d. Not enough information given.
____
6. An object that has kinetic energy must be
a. at rest.
b. falling.
c. moving.
d. elevated.
____
7. Which has greater kinetic energy, a car traveling at 30 km/h or a half-as-massive car traveling at 60 km/h?
a. The 60 km/h car
b. Both have the same kinetic energy.
c. The 30 km/h car
____
8. An arrow in a bow has 70 J of potential energy. Assuming no loss of energy to heat, how much kinetic energy
will it have after it has been shot?
a. 0 J
b. 35 J
c. 50 J
d. 70 J
Energy Test: Study Guide (Applied Physics)
____
9. As a pendulum swings back and forth
a. at the end points of its swing, its energy is all potential.
b. kinetic energy is transformed into potential energy.
c. potential energy is transformed into kinetic energy.
d. all of the above
____ 10. Suppose a moving car has 3000 J of kinetic energy. If the car's speed doubles, how much kinetic energy will it
then have?
a. 3000 J
b. 1500 J
c. 1000 J
d. 12,000 J
____ 11. Kinetic energy of an object is equal to
a. its mass multiplied by its acceleration squared.
b. one half the product of its mass times its speed squared.
c. its mass multiplied by its speed.
d. one half the product of its mass times its speed.
____ 12. A 60-N object moves at 1 m/s. Its kinetic energy is
a. 1 J.
b. 3 J.
c. 60 J.
d. more than 60 J.
____ 13. The amount of potential energy possessed by an elevated object is equal to
a. the power used to lift it.
b. the distance it is lifted.
c. the force needed to lift it.
d. the work done in lifting it.
____ 14. Rockets are launched from an airplane in the forward direction of motion. The kinetic energy of the airplane
will be
a. unchanged.
b. increased.
c. decreased.
____ 15. Potential energy is the energy an object has because of its
a. density.
b. size.
c. location.
d. speed.
Energy Test: Study Guide (Applied Physics)
_______16.
TRUE / FALSE: Kinetic energy is directly proportional to objects
speed.
______17.
True/False: Work is the transfer of energy that results from
applying a force over a distance
______18.
Geothermal energy comes from A. The Sun B. The Earth’s underground water reservoirs
C. Nuclear fuel rods
D. Fossil fuels
______19.
TRUE / FALSE: An object has more kinetic energy as it is raised it to
greater and greater heights.
______20.
TRUE / FALSE: Energy that is stored in readiness is called potential
energy
______21.
If the mass of an object is doubled, it will A. Double its potential energy B. Halve its
potential energy
______22.
C. Quadruple its potential energy D. None of these are correct
TRUE / FALSE: If you want to give an object more kinetic energy,
you should do more work on the object.
_______23.
The unit for energy is the A. Volt B. Kilogram C. Joule D. Ampere
______24.
Mechanical energy is defined as A. The energy possessed by an automobile
B. Kinetic energy C. Potential energy D. Both B & C are correct
_______25.
TRUE / FALSE: Energy can be created and destroyed
Energy Test: Study Guide (Applied Physics)
Classify the following as a type of potential energy or kinetic energy (use the letters K or P)
1. A bicyclist pedaling up a hill
_____ 2. An archer with his bow drawn
3. A volleyball player spiking a ball
_____ 4. A baseball thrown to second base
_____
5. The chemical bonds in sugar
_____ 6. The wind blowing through your hair
_____
7. Walking down the street
_____ 8. Sitting in the top of a tree
_____
9. A bowling ball rolling down the alley _____ 10. A bowling ball sitting on the rack
_____
_____
What examples can you find in your home that are examples of kinetic and potential energy (name two for each type of energy)?
11. Kinetic: __________________________________________________________________________
12. Kinetic: __________________________________________________________________________
13. Potential: _________________________________________________________________________
14. Potential: _________________________________________________________________________
Energy Test: Study Guide (Applied Physics)
Solve the following word problems using the kinetic and potential energy formulas (Be sure to show your work!)
15. Determine the kinetic energy of a 1000-kg roller coaster car that is moving with a speed of 20.0 m/s.
16. If the roller coaster car in the above problem were moving with twice the speed, then what would be its new kinetic ener
17. Missy Diwater, the former platform diver for the Ringling Brother's Circus had a kinetic energy of
15,000 J just prior to hitting the bucket of water. If Missy's mass is 50 kg, then what is her speed?
18. A cart is loaded with a brick and pulled at constant speed along an inclined plane to the height of a seat-top. If the mass o
the loaded cart is 3.0 kg and the height of the seat top is 0.45 meters, then what is the potential energy of the loaded cart at t
height of the seat-top?
19. A 75-kg refrigerator is located on the 70th floor of a skyscraper (300 meters above the ground) What is the potential ener
of the refrigerator?
20. The potential energy of a 40-kg cannon ball is 14000 J. How high was the cannon ball to have this much potential energy