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- Multiple ChoicePlease save your changes before editing any questions.
If the force on an object is in the negative direction, the work it does on the object must be

zero

positive

nagative

The work could be either positive or negative, depending on the direction of the object's motion.

- Multiple ChoicePlease save your changes before editing any questions.
A truck has four times the mass of a car and is moving with twice the speed of the car. If K

_{t}and K_{c}refer to the kinetic energies of truck and car respectively, it is correct to say thatK

_{t}= K_{c}K

_{t}= 2K_{c}K

_{t}= 4K_{c}K

_{t}= 16K_{c} - Multiple ChoicePlease save your changes before editing any questions.
Which of the following bodies has the largest

kinetic energy?

Mass 3M and speed V

Mass 3M and speed 2V

Mass 2M and speed 3V

Mass M and speed 4V

- Multiple ChoicePlease save your changes before editing any questions.
What are the KE and the GPE of the brick 1s after it is dropped?

KE = 80J and GPE = 0J

GPE = 68J and KE = 12J

KE = 40 J and GPE = 40 J

GPE = 30J and KE = 50J

- Multiple ChoicePlease save your changes before editing any questions.
What is the approximate speed of the brick 1s after it is dropped, if the mass is 1kg?

3 m/s

10 m/s

30 m/s

50 m/s

- Multiple ChoicePlease save your changes before editing any questions.
A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is

one-fourth as much

one-half as much

twice as much

four times as much

- Multiple ChoicePlease save your changes before editing any questions.
You lift a 3kg pumpkin to a height of 0.80 m to check it out. How much work do you do on the pumpkin when you lift it from the ground?

0.24 kg

2.4 kg

24 kg

240 kg

- Multiple ChoicePlease save your changes before editing any questions.
An intern pushes a 70-kg patient on a 10-kg gurney, producing an acceleration of 0.50 m/s

^{2}.How does the amount of work change if the force is doubled and the distance is halved?

*W*_{new}=*W*_{old}*W*_{new}=*2W*_{old}*W*_{new}=*4W*_{old}*W*_{new}=0.5*W*_{old} - Multiple ChoicePlease save your changes before editing any questions.
Which is true?

Gravitational force always does negative work on a vertically moving object as it always opposes motion.

Friction always does negative work on an object, as it always opposes motion

Both are true

- Multiple ChoicePlease save your changes before editing any questions.
To move a suitcase up to the check-in stand at an airport, a student pushes with a horizontal force through a distance of 0.90 m. If the work done by the student is 18 J, what is the magnitude of the force he exerts?

F = 20 N

F = 16.2 N

F = 34 N

F = 120 N

- Multiple ChoicePlease save your changes before editing any questions.
The kinetic energy of a small boat is 15000 J. If the boat’s speed is 5.0 m/s, what is its mass?

1200 kg

11 kg

1560 kg

75000 kg

- Multiple ChoicePlease save your changes before editing any questions.
The gravitational potential energy of a person on a 3.0 m high diving board is 1800 J. What is the person’s mass?

60 kg

25 kg

5400 kg

360 kg

- Multiple ChoicePlease save your changes before editing any questions.
The net force on an object changes with its position according to the force-position graph shown below. Find the work done between x = 0 m and x = 70 m.

200 J

800 J

1200 J

1600 J

- Multiple ChoicePlease save your changes before editing any questions.
How much work is done by a car if it changes its KE from 600J to 200J which applying its brake?

- 800J

+ 800J

- 400J

+ 400J