What is the spring constant of a spring of negligible mass which gained 8 J of potential energy as a result of being compressed 0.4 m ?

100 N/m

50 N/m

40 N/m

0.3 N/m

The spring constant of a spring is 200 N/m. What force is needed to compress the spring a distance of 0.025 m?

5 N

10 N

8000 N

50 N

A spring is stretched 0.020 m. The elastic potential energy stored in the spring is 0.20 J. What is the spring constant?

1000 N/m

500 N/m

0.1 N/m

4 N/m

How does the elastic PE stored in a spring change when it is stretched from 0.1 m to 0.2 m?

it is quartered

it doubles

it quadruples

it is halved

If the velocity of an automobile is doubled, its KE

decreases to one-half

quadruples

doubles

decreases to one-fourth

A 20. N block falls freely from rest from a point 3.0 m above the earth's surface. With respect to the surface of the earth, what is the gravitational PE of the block-Earth system after the block has fallen 1.5 m?

20. J

30. J

60. J

120 J

An object 10 m above the ground has Z J of potential energy. If the object falls freely, how many joules of kinetic energy will it have gained when it is 5 m above the ground?

Z

2Z

Z/2

0

At what point in its fall does the KE of a freely falling object equal its PE?

at the start of the fall

halfway between the start and the end

at the end of the fall

at all points during the fall

A simple pendulum whose mass is 1.00 kg swings to a maximum height of 0.200 m above its lowest point. The KE of the pendulum bob at the lowest point in its swing is

0.980 J

1.96 J

9.80 J

19.6 J

As an object slides down a frictionless incline, the sum of the gravitational PE and the KE of the object