Download Ch 07 Energy Sample Questions I did NOT include the answers to

Ch 07 Energy Sample Questions
I did NOT include the answers to the problems that need to be worked out.
If you will show me your work I will tell you if you are correct.
1. Potential energy is energy due to the:
A. height of an object.
B. speed of an object.
C. temperature of an object.
D. motion of an object.
2. The brakes on an automobile become hot when they are used continuously because:
A. the friction of the brakes causes an increase in potential energy.
B. the friction of the brakes causes an increase in kinetic energy..
C. kinetic energy is being converted to thermal energy.
D. potential energy is being converted to thermal energy.
3. A 20-newton cart is lifted up 0.40 meters to the top of a ramp. What is the amount of potential energy
gained by the cart?
4. What is a requirement of doing work?
A. Energy
B. Mass
C. Weight
D. Speed
5. Which type of energy does a stretched spring contain?
A. Chemical energy
B. Radiant energy
C. Electrical energy
D. Elastic energy
6. What is the kinetic energy of a go-cart with a mass of 150 kilograms and a speed of 20. m/s?
7. How high would you need to lift a 2-kg bottle of soda to increase its potential energy by 500 joules?
8. If you go twice as fast, your kinetic energy becomes:
A. 2 times smaller.
B. 4 times smaller.
C. 2 times bigger.
D. 4 times bigger.
9. What happens to the potential energy of a car parked at the top of a hill if you double the mass of the car?
A. It decreases by 2 times.
B. It increases by 2 times
C. It decreases by 4 times
D. It increases by 4 times
10. Which of the following stores energy?
A. Food
B. A battery
C. A stretched rubber band
D. All of the above
11. An extended spring stores:
A. kinetic energy.
B. chemical energy.
C. radiant energy.
D. potential energy.
12. Exercise may transform the chemical energy in the food you eat into:
A. both kinetic and potential energy.
B. neither kinetic or potential energy
C. potential energy.
D. kinetic energy.
13. Kinetic energy increases with:
A. mass and distance.
B. speed and distance.
C. speed and time.
D. mass and speed.
14. What happens to the kinetic energy of a moving car if you double the mass of the car?
A. It increases by 4 times
B. It decreases by 2 times.
C. It decreases by 4 times
D. It increases by 2 times
15. When energy in a system is transformed, what happens to the total amount of energy in the system?
A. It increases.
B. It stays the same.
C. It goes to zero.
D. It decreases.
16. A marble rolls along the track below with no friction. The sequence of positions on the track listed in order
from the lowest kinetic energy to the highest kinetic energy is:
17. Friction between two surfaces transforms energy of motion directly to:
A. chemical energy.
B. thermal energy.
C. electric energy.
D. nuclear energy.
18. As a car is slowed, most of its kinetic energy is converted by the brakes to:
A. potential energy.
B. electrical energy.
C. thermal energy.
D. chemical energy.
19. Natalie lifts a 15-kg rock from the ground onto a 1.5 meter high wall. What is the amount of potential
energy she has given the rock?
20. A 1,500-kg car accelerates along a flat track to a speed of 20 m/s. How much does its gravitational potential
energy increase over the length of the track?
21. Which of the following is a form of radiant energy?
A. Gasoline
B. Light
C. Sound
D. Batteries
22. Which of the following is a TRUE statement?
A. Power plants convert other sources of energy into usable electrical energy.
B. Every time you turn on a light, you destroy a little more of Earth’s total energy.
C. Once all the oil and gas on Earth is used up, all Earth’s energy will be gone.
D. Electric power plants make energy.
23. What provides most of Earth’s energy for living things and technology?
A. Mars
B. Oil and gas
C. Gravity
D. The Sun
Kevin jumps straight up in the air to a height of 1 meter. At the top of his jump, he has potential
energy of 1,000 joules. Answer the following questions based on these numbers.
24. If Kevin’s potential energy at the highest point of the jump is 1,000 joules, what is his speed when he leaves
the ground?
25. What is Kevin’s weight?
26. When gasoline is used as fuel in an automobile engine several energy transformations take place. Which of
the following statements does NOT agree with the law of conservation of energy?
A. Once the energy in the gasoline is released, it can never be destroyed.
B. When gasoline is burned, its energy is destroyed.
C. As the energy in the form of gasoline decreases, the energy increases in another form.
D. The energy from the gasoline can be transformed to produce light.
27. While sitting next to a campfire, Kenai noticed several different forms of energy being transformed from
the potential chemical energy of the wood. Which form of energy would she NOT see in the campfire?
A. Nuclear
B. Light
C. Heat
D. Sound
28. Batteries are devices that change chemical energy to ____ energy.
A. mechanical
B. radiant
C. nuclear
D. electrical
29. On what does kinetic energy depend?
A. Gravity and height
B. Gravity and mass
C. Velocity and gravity
D. Mass and velocity
30. Ball #1 is rolled down the steeper side of a hill while ball #2 rolls down the opposite side which is less
steep. Both balls roll out onto a flat surface at the same level. Assuming there is no friction, how do the
speeds of the balls compare when they reach the flat surface?
31. Energy can be thought of as stored ____.
A. Work
B. Mass
C. Force
D. Weight
32. As an object is raised to a higher position, which type of energy increases?
A. heat energy.
B. kinetic energy.
C. light energy.
D. potential energy.
33. What happens to the energy stored in oil when you use it to heat your house?
A. It stays exactly the same.
B. It is used up.
C. It is destroyed.
D. It is converted to heat energy.
34. A moving car has kinetic energy. To bring the car to rest, you must decrease its kinetic energy to zero. The
brakes do this work by applying a force over a distance. What effect would doubling the speed have on the
braking distance?
A. The braking distance would be 4 times smaller.
B. The braking distance would be 2 times smaller.
C. The braking distance would be 2 times greater.
D. The braking distance would be 4 times greater.
35. A bowler lifts her bowling ball a distance of 0.5 meters using 35 joules of energy. What is the mass of her
bowling ball?
36. Energy is measured in:
A. newtons.
B. joules.
C. kg•m/s2
D. kg/m2
37. A 0.6-kilogram basketball balances on the rim of a basketball hoop that is 3 meters high. What is the
basketball’s potential energy?
38. When a ball is thrown into the air, the potential energy gained must come from its kinetic energy. As the
ball gains potential energy, its speed will:
A. increase.
B. decrease.
C. remain the same.
D. Not enough information is given.
Ch 07 Energy Sample Questions
Answer Section
MULTIPLE CHOICE
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35.
ANS: A
ANS: C
ANS:
ANS: A
ANS: D
ANS:
ANS:
ANS: D
ANS: B
ANS: D
ANS: D
ANS: A
ANS: D
ANS: D
ANS: B
ANS: 1,5,4,2,3,6
ANS: B
ANS: C
ANS:
ANS:
ANS: B
ANS: A
ANS: D
ANS:
ANS:
ANS: B
ANS: A
ANS: D
ANS: D
Conversion from potential energy to kinetic energy is independent of the path. Both balls will have the
same kinetic energy and same speed at the bottom since they both “fall” the same vertical distance.
ANS: A
ANS: D
ANS: D
ANS: D, Since doubling the speed would quadruple the kinetic energy (KE = 1/2mv2), the amount of
work necessary to bring the car to rest would have to equal the magnitude of the KE, i.e., 4 times as much.
Since the force applied by the brakes is limited to some maximum amount, the distance over which the
force is applied must be quadrupled.
36. ANS:B
37. ANS:
38.
ANS: B