Question

A) How is a joule defined? (1 point)
It is the work done when a force of 1 newton is applied to accelerate an object by 1 kilogram per second
squared.
It is the work done when a force of 1 newton is applied to an object for a distance of 1 meter.
It is the force needed to make an object with a mass of 1 kilogram accelerate by 1 kilogram per second
squared.
It is the force needed to make an object with a mass of 1 kilogram travel 1 meter.

A) A soccer player kicks a ball, applying a force of 1,000 newtons over a distance of 0.2 meter. The ball
travels 50 meters down the field before another player stops the ball. How much work was done during
the kick? (1 point)
5,000 joules
10 joules
50,000 joules
200 joules

A) A person raises a box with a weight of 50 newtons by 0.5 meter. How much work does the person do
in this action? (1 point)
100 joules
25 joules
0.0 joules
0.01 joule

A) A person gets a running start toward a wall from 5 meters away. The person pushes the wall with a
force of 500 newtons, but the wall does not move. How much work is done by the person? (1 point)
0.01 joule
100 joules
2,500 joules
0 joules

Answer 1

1) It is the work done when a force of 1 newton is applied to an object for a distance of 1 meter.

2) 200 joules. (W = F·d = 1000 N × 0.2 m = 200 J)

3) 25 joules. (W = weight × height = 50 N × 0.5 m = 25 J)

4) 0 joules. (No displacement of the wall → no work done)