Happy Belated Birthday Aimee!

1. Happy Belated Birthday Aimee!

2. Happy Early Birthday Abigail!

3. Energy

4. What is energy? Learning Target: I will be able to define what energy is.

5. It makes changes and does work for us.

6. Energy is measured in joules. J Learning target: I can state the unit to measure energy.

7. After James Prescott Joule.

8. What is work? Learning target: I can give the correct definition of work.

9. Work is.. When a force causes an object to move in the direction of the force.

10. Force direction Force direction

11. Calculating Work W = F D x distance Work force Learning Target: I can solve work problems

12. Work is measured in Joules

13. So for example.... What work would a horse do if it used 1000N over 100m?

14. 100,000 J Or 100kj Learning Target: I can solve work problems Calculation practice formative

15. Joke.. Did you hear about the criminal who never had to do any work????

16. He was a joule thief.

17. Watt is power? Learning target: I can correctly define the term power.

18. Power is the rate at which work is done.

19. Power is measured in Watt? Learning target: I can state the unit used to measure power.

20. W w P = t t P Learning target: I can solve equations for power.

21. POWER LAB

22. Machines Learning target: I will be able to explain how machines make work easier.

23. A machine is a device that makes work easier.

24. Machines change the size Or the direction of the force.

25. Work is not made less. Work in = Work out 3m 1m 450N 150N W= FxD W= FxD 150 x 3 450 x 1 450j 450j

26. Some machines make work easier than others. Some machines can increase force more than others.

27. Mechanical advantage This tells you how much The machine has increased your force.

28. Output force MA = Input force input force 500N 50 N output force

29. 500N 10 = MA= 50N

30. Ideal mechanical advantage IMA = LENGTH ÷ HEIGHT IMA = 12 ÷ 4 IMA = 3

31. The work out can never be greater than work in!

32. Some energy gets wasted Because of friction.

33. The less friction a machine has the more efficient it is.

34. Mechanical This is % efficiency Work out = M 100 x e Work in

35. There are 2 types of machines. simple & compound

36. There are 6 types of simple machines.

37. Pulleys Learning target: Simple machines increase mechanical advantage.

38. The more complex the pulley… The greater the mechanical advantage Learning target: Simple machines increase mechanical advantage.

40. What did you notice about the amount of wire you had to use as you made the pulleys more complicated?

41. LARGE FORCE……………SHORT DISTANCE SMALL FORCE……………LARGE DISTANCE FxD = FxD YOU CANNOT CHANGE THE WORK THAT NEEDS TO GET DONE!

42. Levers A bar that pivots on a fixed point.

44. There are three classes of lever…

47. Inclined planes Also known as ramps!

48. You have to use less input force. The MA of inclined planes: The more gradual the ramp the more MA there is.

50. Wedges They are moveable inclined planes.