                        NCFE 2013 Part 1
Accessed 10 June 2017
released 2013

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1. The graph below represents the displacement of an object over time. Which best describes the velocity of the object?
1. The velocity increases at a constant rate.
2. The velocity remains the same.
3. The velocity decreases at a constant rate.
4. The velocity remains at zero.
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2. What can be concluded about the shape of an acceleration vs. time graph when the instantaneous acceleration of an object and its average acceleration are the same?
1. It is a curved line.
2. It is a zigzag line.
3. It is a straight line parallel to the time axis.
4. It is a straight line parallel to the acceleration axis.
 A B C D
3. A car traveling at 6.1 m/s increases its speed to 36.5 m/s in 9.9 s. What assumption can be made about the acceleration of the car?
1. The instantaneous acceleration of the car is 2.2 m/s/s.
2. The average acceleration of the car is 3.1 m/s/s.
3. The instantaneous acceleration of the car is 3.7 m/s/s.
4. The average acceleration of the car is 4.3 m/s/s.
 A B C D
4. A stone is dropped into water from a bridge 52 m above the waterâ€™s surface. What can be determined about the stone when it reaches the water?
1. Its mass is 16 kg.
2. Its velocity is −45 m/s.
3. Its speed is 32 m/s
4. Its acceleration is −23 m/s/s.
 A B C D
5. This table shows the relationship between the force on an object and the objectâ€™s resulting acceleration. What is the mass of the object?
1. 0.2 kg
2. 0.5 kg
3. 1 kg
4. 2 kg
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6. Two different forces act on an object moving on a frictionless surface. What amount of force is moving the object?
1. 6.0 N
2. 12 N
3. 18 N
4. 24 N
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7. A car travels around a curved track. It moves twice as fast the second time around the track, as compared to the first time. What can be concluded about the centripetal force as the car travels around the track for the second time?
1. The centripetal force is one-fourth the original amount.
2. The centripetal force is one-half the original amount.
3. The centripetal force is twice the original amount.
4. The centripetal force is four times the original amount.
 A B C D
8. An object moves in uniform circular motion. What is true regarding the force on the object?
1. The direction is away from the center, and its magnitude varies.
2. The direction is toward the center, and its magnitude varies.
3. The direction is away from the center, and its magnitude is constant.
4. The direction is toward the center, and its magnitude is constant.
 A B C D
9. Two objects are held close to each other with a compressed spring between them. When the objects are released, one object moves at a speed of 0.63 m/s, and the other object moves at a speed of 0.45 m/s. If the faster object has a mass of 0.035 kg, what is the mass of the slower object?
1. less than 0.035 kg but greater than 0.0 kg
2. equal to 0.035 kg
3. greater than 0.035 kg but less than 0.070 kg
4. greater than 0.070 kg
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10. A box slides on frictionless ice and collides with another box sliding in the same direction. If the two boxes stick together after the collision, what assumption can be made about the type of collision that occurred?
1. It was a completely inelastic collision.
2. It was an inelastic collision.
3. It was an elastic collision.
4. It was a completely elastic collision.
 A B C D
11. Which could cause a decrease in the momentum of a moving object?
1. a decrease in volume
2. an increase in volume
3. a decrease in speed
4. an increase in speed
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12. A 0.25-kg block is traveling along a horizontal, frictionless surface at a speed of 2.8 m/s. The block hits a wall and returns in the opposite direction at a speed of 1.7 m/s. What is the approximate impulse of the block on the wall?
1. 0.28 kg m/s
2. 1.1 kg m/s
3. 4.4 kg m/s
4. 18 kg m/s
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13. A student riding a bicycle doubles his speed. By what factor does the kinetic energy of the student and bicycle change?
1. ¼
2. ½
3. 2
4. 4
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14. If a person reduces the acceleration of an object by a factor of two, what happens to the amount of work being done?
1. The magnitude of the work performed quadruples.
2. The magnitude of the work performed doubles.
3. The magnitude of the work performed is reduced by half.
4. The magnitude of the work performed is reduced by one-fourth.
 A B C D
15. Spring X has a spring constant of 120 N/m and is compressed 0.23 m relative to its natural length. Spring Y has a spring constant of 150 N/m. How far does spring Y need to be compressed relative to its natural length for it to have the same amount of stored elastic potential energy as Spring X?
1. 0.21 m
2. 0.29 m
3. 0.43 m
4. 0.61 m
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16. A 75-kg box dropped from rest at the top of a 33-m high tower falls freely to the ground. How much kinetic and potential energy does the box have when it reaches 15 m above the ground? (Ignore friction.)
1. The box has 3.6 × 103 J of kinetic energy and 0.0 J of potential energy.
2. The box has 1.1 × 104 J of kinetic energy and 1.3× 104 J of potential energy.
3. The box has 1.3 × 104 J of kinetic energy and 1.1 × 104 J of potential energy.
4. The box has 2.4 × 104 J of kinetic energy and 0.0 J of potential energy.
 A B C D
17. Machine X produces the least amount of power in a factory. Since power is determined by the amount of work done and the time it takes, which Work vs. Time graph explains the power produced by Machine X?
 A. B. C. D. A B C D
18. A person uses 25.0 J of kinetic energy to push an object for 11.0 s. How are work and power affected if the person uses the same amount of kinetic energy to push the object in less time?
1. The power will increase, and the amount of work will increase.
2. The power will increase, and the amount of work will remain the same.
3. The power will decrease, and the amount of work will remain the same.
4. The power will decrease, and the amount of work will decrease.
 A B C D
19. An object produces a sound of constant frequency. If the object moves toward a student who is standing still, what happens to the pitch and the wavelength of the sound the student hears while the object is getting closer?
1. pitch increases, and wavelength decreases
2. pitch increases, and wavelength increases
3. pitch decreases, and wavelength increases
4. pitch decreases, and wavelength decreases
 A B C D
20. The diagram below represents a wave. If its frequency is 25 Hz, what is the approximate speed of the wave?
1. 78 m/s
2. 138 m/s
3. 160 m/s
4. 280 m/s Additional North Carolina Exam Questions