1. Starter
Round the room TIME TO BEAT 2.12

2. What is meant by the phrase “work done” and how can we work this out?
Starter:
Make a list of anything you would describe as “work”.

3. Learning Outcomes
measure the work done when a force (eg a lifting or pushing force) moves an object
look at the changes in kinetic or in potential energy when work is done by, or on, an object

4. What is work? ?

5. Work done
When an object is moved by a force, work is done on the object. E.g. a car moving, a person lifting,
The force transfers energy to the object.
The amount of energy transferred is equal to the work done.
measure the work done when a force (eg a lifting or pushing force) moves an object

6. Energy changes through work
What energy changes occur in the following situations.
A ball rolls down the stairs.
A man pushes his car along a flat road.
A weightlifter lifts up his masses.
An rollercoaster drops vertically 50 feet.
look at the changes in kinetic or in potential energy when work is done by, or on, an object

7. Equation 1 Equation 2 Change in energy (J) = work done (J)
Work done (J) = force (N) x distance moved (m)
W = F x D

8. Example
A Danny pushes a wheel barrow 5 m with a force of 50 N. how much work was done?
Tom pushes a box 10m with a force of 60N. What is the work done?
Dougie does 100J of work over 5m. How much force was he exerting?
Tom pulls a truck 40m using a force of 2000N. How much work did he do?
250J, 600J, 20N, 80000J

9. Lets investigate.
Aim : how much work is done lifting a 1kg masses different distances. Remember 1 kg has a weight (force) of 10N
Distance lifted
Force
Work done.

10. Task
Design your own question on calculating work. Make up a scenario. Estimate the forces, work done and distances used.
Write the correct answer in the back of your book
Swap books and let someone else try your question

11. Task On a sheet of a4 paper: Title: Equation summary sheet
On this sheet write out ALL the equations that we have used so far. Include the units.
Explain what these equations work out
GIVE AN EXAMPLE and STICK this in the front of your book

12. Plenary
Revision card