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5.3 Simple Machines. 6 Types   Lever  A bar that is free to pivot about a fixed point (fulcrum)  : the fixed point  : distance from the fulcrum.

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Presentation on theme: "5.3 Simple Machines. 6 Types   Lever  A bar that is free to pivot about a fixed point (fulcrum)  : the fixed point  : distance from the fulcrum."— Presentation transcript:

1 5.3 Simple Machines

2 6 Types  

3 Lever  A bar that is free to pivot about a fixed point (fulcrum)  : the fixed point  : distance from the fulcrum to where the effort force is applied.  : distance from the fulcrum to where the resistance force is applied

4 3 Classes of Levers   

5 First Class Lever  Used to, always changes the of the applied force. Ex. Screwdriver used to pry paint can lid  Fulcrum is in the

6 Second Class Lever  Always – does not change direction of force. Ex. Wheelbarrow  Resistance is located between the

7 Third Class Lever  Increases the over which the resistance force is applied. (Does not multiply force) Ex. Baseball bat or hockey stick  Effort force is

8 Mechanical Advantage  Lever IMA = length of effort arm length of resistance arm Making the effort arm increases the IMA.

9 Pulley  Fixed Pulley: modified first class lever Attached to ceiling or wall Changes  Moveable Pulley: Multiplies IMA = Distance you pull is the resistance distance

10 Pulley (cont.)  Block and Tackle System of IMA =

11 Wheel and Axle  Machine with that rotate together (gears) Ex. Door knob  IMA = radius of wheel radius of axle Can be increased by making the

12 Inclined Planes  Sloping surface  Reduces the  IMA = length height *the the ramp the less force required

13 Screw  Inclined plane wrapped around a cylinder.  The closer together the threads, the easier to screw into wood

14 Wedge  Inclined plane with one or two sloping sides  Changes the

15 Compound Machine  Two or more simple machines used together. Ex. Can opener Car


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