Question

1. The concept of work is equivalent to a transfer of energy.

True

False

2. Work is required to transfer energy from one form to another, for example, to convert kinetic energy into potential energy.

True

False

3. An object with mass of 1000 kg is moving at a rate of 20 m/s. Its kinetic energy is

a. 0 J

b. 20,000 J

c. 200,000 J

d. 400,000 J

4. A car speeds up from 10 m/s to 15 m/s. After some time, it speeds up by another 5 m/s to a speed of 20 m/s. The amount of work in speeding up from 10 m/s to 15 m/s is the same as the work required to speed up from 15 m/s to 20 m/s.

True

False

5. An object is lowered from a height of 10 m to 2 m. In this process, the object is gaining gravitational potential energy.

True

False

6. An object with a mass of 5 kg t is raised from a height of 2 m to 10 m. How much potential energy did the object gain?

a. 40 J

b. 100 J

c. 400 J

d. 500 J

7. An object at rest is dropped from a 30 m tall tower. How fast is the object moving right before impact with the ground?

a. 8 m/s

b. 16 m/s

c. 24 m/s

d. 32 m/s

8. A bullet with a mass of 7.45 g is fired horizontally into a piece of wood. The initial speed of the bullet is 360 m/s. After coming to a complete stop, how much energy was transferred from the bullet?

a. 483 J

b. 10,400 J

c. 54,000 J

d. 483,000 J

Answer 1