Chapter 6: Work And Energy
- 1.What is the correct unit of work expressed in SI units?
- A.
Kg m/s^2
- B.
Kg m^2/s
- C.
Kg m^2/s^2
- D.
Kg^2 m/s^2
- 2.Can work be done on a system if there is no motion?
- A.
Yes, if an outside force is provided.
- B.
Yes, since motion is only relative.
- C.
No, since a system which is not moving has no energy.
- D.
No, because of the way work is defined.
- 3.If you push twice as hard against a stationary brick wall, the amount of work you do
- A.
Doubles.
- B.
Is cut in half.
- C.
Remains constant but non-zero.
- D.
Remains constant at zero.
- 4.A 50-N object was lifted 2.0 m vertically and is being held there. How much work is being done in holding the box in this position?
- A.
More than 100 J
- B.
100 J
- C.
Less than 100 J, but more than 0 J
- D.
0 J
- 5.If you walk 5.0 m horizontally forward at a constant velocity carrying a 10-N object, the amount of work you do is
- A.
More than 50 J.
- B.
Equal to 50 J.
- C.
Less than 50 J, but more than 0 J.
- D.
Zero.
- 6.A container of water is lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much work was done?
- A.
45 J
- B.
90 J
- C.
180 J
- D.
No work was done.
- 7.Does the centripetal force acting on an object do work on the object?
- A.
Yes, since a force acts and the object moves, and work is force times distance.
- B.
Yes, since it takes energy to turn an object.
- C.
No, because the object has constant speed.
- D.
No, because the force and the displacement of the object are perpendicular.
- 8.You throw a ball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down.
- A.
Work is + on the way up and + on the way down.
- B.
Work is + on the way up and - on the way down.
- C.
Work is - on the way up and + on the way down.
- D.
Work is - on the way up and - on the way down.
- 9.The area under the curve, on a Force versus position (F vs. x) graph, represents
- A.
Work.
- B.
Kinetic energy.
- C.
Power.
- D.
Potential energy.
- 10.On a plot of Force versus position (F vs. x), what represents the work done by the force F?
- A.
The slope of the curve
- B.
The length of the curve
- C.
The area under the curve
- D.
The product of the maximum force times the maximum x
- 11.The quantity 1/2 mv^2 is
- A.
The kinetic energy of the object.
- B.
The potential energy of the object.
- C.
The work done on the object by the force.
- D.
The power supplied to the object by the force.
- 12.If the net work done on an object is positive, then the object's kinetic energy
- A.
Decreases.
- B.
Remains the same.
- C.
Increases.
- D.
Is zero.
- 13.If the net work done on an object is negative, then the object's kinetic energy
- A.
Decreases.
- B.
Remains the same.
- C.
Increases.
- D.
Is zero.
- 14.If the net work done on an object is zero, then the object's kinetic energy
- A.
Decreases.
- B.
Remains the same.
- C.
Increases.
- D.
Is zero.
- 15.A truck weighs twice as much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the car?
- A.
All that can be said is that the truck has more kinetic energy.
- B.
The truck has twice the kinetic energy of the car.
- C.
The truck has 4 times the kinetic energy of the car.
- D.
The truck has 8 times the kinetic energy of the car.
- 16.Car J moves twice as fast as car K, and car J has half the mass of car K. The kinetic energy of car J, compared to car K is
- A.
The same.
- B.
2 to 1.
- C.
4 to 1.
- D.
1 to 2.
- 17.An object hits a wall and bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energy?
- A.
1/2
- B.
1/4
- C.
2
- D.
4
- 18.A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?
- A.
25 to 9
- B.
5 to 3
- C.
12.5 to 4.5
- D.
3 to 5
- 19.A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?
- A.
The 4.0-kg mass
- B.
The 1.0-kg mass
- C.
Both travel the same distance.
- D.
Cannot be determined from the information given
- 20.You slam on the brakes of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?
- A.
It would have skidded 4 times farther.
- B.
It would have skidded twice as far.
- C.
It would have skidded 1.4 times farther.
- D.
It is impossible to tell from the information given.
- 21.A planet of constant mass orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energy?
- A.
It remains constant.
- B.
It increases continually.
- C.
It decreases continually.
- D.
It increases when the planet approaches the Sun, and decreases when it moves farther away.
- 22.The quantity mgy is
- A.
The kinetic energy of the object.
- B.
The gravitational potential energy of the object.
- C.
The work done on the object by the force.
- D.
The power supplied to the object by the force.
- 23.The quantity 1/2 kx^2 is
- A.
The kinetic energy of the object.
- B.
The elastic potential energy of the object.
- C.
The work done on the object by the force.
- D.
The power supplied to the object by the force.
- 24.Is it possible for a system to have negative potential energy?
- A.
Yes, as long as the total energy is positive.
- B.
Yes, since the choice of the zero of potential energy is arbitrary.
- C.
No, because the kinetic energy of a system must equal its potential energy.
- D.
No, because this would have no physical meaning.
- 25.An object is released from rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared to the first is
- A.
One-fourth as much.
- B.
One-half as much.
- C.
Twice as much.
- D.
Four times as much.
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