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Work Done
Learning Objectives:
5 - Use the work done equation correctly
6/7 - Rearrange the equation and use it in different forms
8 – Use powers to express or convert units of work
What is mass measured in?
What is weight measured in?
What causes weight?
What is energy measured in?

What have they got in common?
1. Discuss your ideas with your partners
2. When asked, share your ideas with another
pair
3. Decide on your group opinion and be ready
to explain it
W = Fd
W = Work done (J)
F = Force (N)
d = Distance moved (m)

work done (joule, J) = force (newton, N) × distance (metre, m)

Exercise Mass
(kg)
Weight
(mass x
10N/kg) This
if the force!!
(N)
Distance per
rep (use only the
upward distance)
(m)
Number of
reps
Total distance
(distance per rep x
No. reps)
(m)
Work done
(Force x total
distance)
(J)
Squats
(use your
bodyweight for
mass)
Bicep curls
(using text
books)
Step ups
(use your
bodyweight for
mass)

Exercise Mass
(kg)
Weight
(mass x
10N/kg)
(N)
Distance per
rep (use only the
upward distance)
(m)
Number of
reps
Total distance
(distance per rep x
No. reps)
Work done
(Force x total
distance)
(J)
Squats
(use your
bodyweight for
mass)
80 800 0.6 10 6 4,800J
Triceps dips
(Use half your
bodyweight for
mass)
40 400 0.4 10 4 1,600J
Bicep curls 5 50 0.7 10 7 350J
Wrist curls 1 10 0.08 10 0.8 8J
Step ups
(use your
bodyweight for
mass)
80 800 0.25 10 2.5 2,000J

Easy – 1 Mark Medium – 2 Marks Hard – 3 Marks
Write the equation to calculate
work done.
What is the work done if we
apply a 1.2N force and we
move 4m in the direction of
force?
Walking up a flight of stairs,
what are the energy transfers?
Rearrange this equation for
force applied.
apply a 7N force and we move
8m in the direction of the
force?
When you roll a ball down a
hill what are the energy
transfers?
distance moved in the
direction of force.
What distance is moved if we
have a 8N force and the work
done is 90J?
What is the work done when a
force of 5kN is applied to a ball
and it moves 0.8km?
What is the unit of force? What is the distance moved if
we have a 70N force and work
done is 8J?
What is the work done to a car
if a force of 9kN is applied and
it moves 7km?
What is the unit of work done? What force is required to move
7m if the work done is 9J?
What force is required if 2.5kJ
moves and object 56cm?

Easy – 1 Mark Medium – 2 Marks Hard – 3 Marks
Write the equation to calculate
work done.
W = Fd
apply a 1.2N force and we
move 4m in the direction of
force? 4.8J
Walking up a flight of stairs,
what are the energy transfers?
kinetic (walking), GPE (height)
(chem in food and thermal in body)
force applied.
F = W/d
apply a 7N force and we move
8m in the direction of the
force? 56m
What energy transfers when a
ball rolls down a hill?
GPE to kinetic
(also thermal)
distance moved in the
direction of force.
d = W/f
What distance is moved if we
have a 8N force and the work
done is 90J?
11.3m
What is the work done when a
force of 5kN is applied to a ball
and it moves 0.8km?
4MJ (4,000,000J)
What is the unit of force?
Newtons (N)
What is the distance moved if
we have a 70N force and work
done is 8J?
0.1m
What is the work done to a car
if a force of 9kN is applied and
it moves 7km?
63MJ (63,000,000J)
What is the unit of work done?
Joules (J)
What force is required to move
7m if the work done is 9J?
1.3N
What force is required if 2.5kJ
moves and object 56cm?
4.5kN (4,464N)
24+ = 8
21-23 = 7
18-20 = 6
15-17 = 5

Bicep Curl using a book(s)
Weigh the books using the weighing scales-
you can decide how many you want to use

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Work Done

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