Chapter 4:
Energy
Practice Test
1.
An object has kinetic energy of 600 J and a speed of 10 m/s. What is its mass?
a.
30,000 kg
b.
60,000 kg
c.
6 kg
d.
12 kg
Hint
2.
A 2 kg book is moved from a shelf 1.5 m off the ground to a shelf 2.0 m off the ground. What is its change in GPE?
a.
9.8 J
b.
29.4 J
c.
68.6 J
d.
39.2 J
Hint
3.
A car is traveling at 35 m/s with a kinetic energy of 3062.5 kJ. What is its mass?
a.
10,000 kg
b.
2500 kg
c.
5000 kg
d.
1250 kg
Hint
4.
A system has a total mechanical energy of 350 J and kinetic energy of 220 J. What is its potential energy?
a.
350 J
b.
220 J
c.
130 J
d.
570 J
Hint
5.
What is the kinetic energy of a 5 kg object moving at 7 m/s?
a.
0.05 J
b.
122.5 J
c.
0.1 J
d.
245 J
Hint
6.
If you have a mass of 240 kg and you are standing on a platform 3 m above the ground, what is your gravitational potential energy?
a.
0.1225 J
b.
73.5 J
c.
784 J
d.
7056 J
Hint
7.
A swing is pulled back and has 98 J of potential energy. The swing is released and swings until it comes to a stop on its own. When the swing comes to a stop, it has 24.5 J of potential energy. How much energy has been converted into heat from friction?
a.
98.0 J
b.
0 J
c.
73.5 J
d.
24.5 J
Hint
8.
If you throw a 0.4 kg ball at a speed of 20 m/s, what is the ball's kinetic energy?
a.
20 J
b.
160 J
c.
40 J
d.
80 J
Hint
9.
An object held in the air has a GPE of 470 J. The object then is dropped. Half-way down, what is the object's kinetic energy?
a.
470 J
b.
0 J
c.
235 J
d.
940 J
Hint
10.
A rollercoaster car moving around a high turn has 100,000 J of GPE and 23,000 J of KE. What is its mechanical energy?
a.
50,000 J
b.
23,000 J
c.
123,000 J
d.
73,000 J
Hint
