Force and work unit test eighth grade
1. What is the formula for calculating work?
a) Work = force x distance
b) Work = mass x acceleration
c) Work = distance / time
d) Work = force / distance
2. Which of the following is the correct unit for force?
a) Newton (N)
b) Watt (W)
c) Joule (J)
d) Kilogram (kg)
3. A force of 10 N is exerted on an object over a distance of 5 meters. What is the work done on the object?
a) 15 J
b) 20 J
c) 50 J
d) 100 J
4. If a force of 20 N is exerted on an object and the object moves a distance of 4 meters, what is the work done on the object?
a) 4 J
b) 16 J
c) 40 J
d) 80 J
5. A person applies a force of 50 N to push a box across a distance of 10 meters. How much work is done on the box?
a) 5 J
b) 50 J
c) 500 J
d) 5000 J
6. Which of the following statements is true about work and force?
a) Work and force are the same thing.
b) Work is a measure of the amount of force applied to an object.
c) The more force is applied to an object, the less work is done.
d) Work is done when a force causes an object to move a distance.
7. What is the formula for calculating force?
a) Force = mass x acceleration
b) Force = work / distance
c) Force = distance / time
d) Force = work x distance
8. A man lifts a 20 kg object to a height of 2 meters. How much work does he do against gravity?
a) 20 J
b) 40 J
c) 80 J
d) 400 J
9. What is the unit of work?
a) Newton (N)
b) Watt (W)
c) Joule (J)
d) Kilogram (kg)
10. Which of the following situations represents work being done?
a) A person holding a book in their hand.
b) A car moving at a constant speed.
c) A ball rolling down a hill.
d) A person lifting a box off the ground.
Answers:
1. a) Work = force x distance
2. a) Newton (N)
3. c) 50 J
4. d) 80 J
5. c) 500 J
6. d) Work is done when a force causes an object to move a distance.
7. a) Force = mass x acceleration
8. c) 80 J
9. c) Joule (J)
10. d) A person lifting a box off the ground.