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 trueb. / 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 carb. / 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 Jb. / 35 J
c. / 50 J
d. / 70 J
____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 Jb. / 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 C. Quadruple its potential energy D. None of these are correct
______22.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
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: ______
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 energy?
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 of 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 the 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 energy 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?