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Work, Power and Simple Machines

Work, Power and Simple Machines. Force 40 N. Work. Distance 10 m. Force acting through a distance. W = F * d = 40 N * 10 m = 400 Joules. Work. Force must be in same direction as distance. Force. Distance. Work. Force must be in same direction as distance.

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Work, Power and Simple Machines

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  1. Work, Power and Simple Machines

  2. Force 40 N Work Distance 10 m Force acting through a distance W = F * d = 40 N * 10 m = 400 Joules

  3. Work • Force must be in same direction as distance Force Distance

  4. Work • Force must be in same direction as distance There is no work being done on the farmer Force Distance

  5. Power 400 J/1 sec = 400 watts 400 J/5 sec = 80 watts How fast (or the rate) Work is done P = W/t

  6. Distance Force Distance Force Distance Force Distance Force How do machines make work easier? Work In Work Out Increase F MA>1 Increase D MA<1 Change direction of F MA=1

  7. Even though machines make work easier, they cannot change the amount of work Work Input Work Output Feffort*distance Fresistance*distance Work Input is always greater than Work Output due to Friction

  8. Even though machines make work easier, Work Input is always greater than Work Output due to Friction % Efficiency = Work Output / Work Input *100 Work Input Work Output Feffort*distance Fresistance*distance 10N*5m= 50J 20N*2m= 40J

  9. Even though machines make work easier, Work Input is always greater than Work Output due to Friction % Efficiency = (40 J / 50 J) = 0.8 Work Input Work Output Feffort*distance Fresistance*distance 10N*5m= 50J 20N*2m= 40J

  10. Even though machines make work easier, Work Input is always greater than Work Output due to Friction % Efficiency = (40 J / 50 J) = 0.8 *100 = 80% Work Input Work Output Feffort*distance Fresistance*distance 10N*5m= 50J 20N*2m= 40J

  11. Inclined Plane A slanted surface used to raise an object

  12. Inclined Plane

  13. Inclined Plane 5 N 5 N

  14. 4 N 5 N Inclined Plane 5 N 5 N Decreases the size of the effort force

  15. 4 N 5 N 5 N 5 N Inclined Plane Decreases the size of the effort force

  16. 5 N 5 N 4 N 5 N Inclined Plane Decreases the size of the effort force Increases the distance

  17. Wedge An inclined plane that moves

  18. Wedge An inclined plane that moves

  19. Wedge An inclined plane that moves

  20. Wedge An inclined plane that moves

  21. Wedge An inclined plane that moves

  22. Wedge An inclined plane that moves

  23. Wedge As a wedge moves through an object to be cut,

  24. Wedge A small effort force

  25. Wedge A small effort force Is able to overcome

  26. Wedge A small effort force Is able to overcome A large resistance force

  27. Wedge A small effort force Is able to overcome A large resistance force

  28. Wedge How can the mechanical advantage be increased?

  29. Wedge How can the mechanical advantage be increased? Reduce the effort force by decreasing the angle

  30. Screw An inclined plane wrapped around a central bar or cylinder to form a spiral

  31. How fast (or the rate) Work is done

  32. 1st class 2 N 2 N Mechanical Advantage = resistance F / effort F =

  33. 1st class 2 N 2 N Mechanical Advantage = resistance F / effort F = 2/2 = 1

  34. 1 N 2nd class 2 N Mechanical Advantage = resistance F / effort F =

  35. 1 N 2nd class 2 N Mechanical Advantage = resistance F / effort F = 2/1 = 2

  36. 3 N 3rd class 2 N Mechanical Advantage = resistance F / effort F

  37. 3 N 3rd class 2 N Mechanical Advantage = resistance F / effort F = 2/3 = 0.66

  38. Pulleys Fixed 5 N 5 N Movable

  39. Pulleys Fixed MA = 5/2.5 =2 2.5 N 2.5 N 5 N MA = 5/5=1 5 N 5 N Movable

  40. Pulleys 2.5 N 2.5 N 5 N 5 N 5 N Resistance distance = Effort distance Resistance distance = 1/2 Effort distance

  41. Wheel and Axle • Two circular objects of different size • The wheel always moves a greater distance than the axle

  42. Wheel and Axle • Wheel : Large Distance, Small Force • Axle : Small Distance, Large Force

  43. Inclined Plane? Wedge? Screw? Lever? Pulley? Wheel and Axle? Compound Machine Corkscrew

  44. Inclined Plane Wedge Screw Lever Pulley Wheel and Axle Compound MachineCorkscrew

  45. Inclined Plane? Wedge? Screw? Lever? Pulley? Wheel and Axle? Compound Machine Drill

  46. Inclined Plane Wedge Screw Lever Pulley Wheel and Axle Compound Machine Drill

  47. Inclined Plane? Wedge? Screw? Lever? Pulley? Wheel and Axle? Compound MachineJack

  48. Inclined Plane Wedge Screw Lever Pulley Wheel and Axle Compound MachineJack

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