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MECHANICAL: Practice Work & Energy calculations

Total questions: 14

Worksheet time: 18mins

Name
Class
Date
1.

It takes 20 N of force to move a box a distance of 10 m. How much work is done on the box in Joules?

a)

200 J

b)

20.0 J

c)

100 J

d)

10 J

2.
Two factors that determine work are
a)
size of the force, and distance
b)
size of the force, and type of force
c)
mass, and distance
3.
units for work are
a)
netwons
b)
joules
c)
meters
d)
seconds
4.

if you push a cart with a force of 60 N for 2 m... how much work have you done?

a)

120 J

b)

30 J

c)

120 N

d)

30 N

5.

Work done = Force x __?__

a)

a. distance

b)

b. acceleration

c)

c. velocity

d)

d. speed

6.

If you do 40 joules of work lifting a 10N box, how high is the shelf you move it to.

a)

400m

b)

40m

c)

50m

d)

4m

7.

You apply a force of 18 N to a dresser and move it 3.0 m. How much work did you do on the dresser?

a)

54 J

b)

6.0 J

c)

21 J

d)

27 J

8.

I do 132 Joules of work on a bookcase. If I apply a force of 6 Newtons, how far have I moved the bookcase?

a)

22 meters

b)

792 meters

c)

17 meters

d)

320 meters

9.

Calculate the work needed to raise a 3 kg cat up to a height of 4 m. (g = 10ms-2)

a)

12 J

b)

0 J

c)

120 J

d)

1.22 J

10.

Sue lowers a stack of books with a mass of 20 kg over a distance of 2 meters. Calculate work. (g = 10ms-2)

a)

400 J

b)

-40 J

c)

-400 J

d)

-20 J

11.
True or false: when the distance an object moves is zero the work done on the object is also zero.  
a)
True
b)
False
12.
What is the work done when a 20-N force pushes a cart 3.5 m?
a)
70J
b)
6.8J
c)
23.5J
d)
17.5J
13.

With all of his Batgear on, Batman has a mass of 90.7 kg. How much work does he have to do to get to his perch on top of a 1,575 m building? (g = 10ms-2)

a)

142.9 kN

b)

142.9 kJ

c)

1.429 MN

d)

1.429 MJ

14.

An aircraft is taking a group of skydivers up into the air. Evan is dressed in his parachuting outfit, which brings his mass to a total of 90.0 kg. The aircraft takes the group to a height of 5000.00 m before the jump. How much work is done in getting Evan safely back to the ground? (g = 10ms-2)

a)

450 kJ

b)

450 kN

c)

4.5 MJ

d)

4.5 MN