1. Simple machines 6 types of simple machines, mechanical advantage of each type and compound machines

2. What is a machine?  Machines make work easier by changing either the force, distance or direction of the force you exert.

3. Mechanical Advantage (MA)= output force/input force  The # of times a machine increases a force

4. The 6 basic types of simple machines  Inclined plane  Wedge  Screw  Lever  Wheel & axle  Pulley

5. Inclined Plane  flat, sloped surface.

6. Mechanical advantage Length of incline Height of incline 11 0.5 meters 4 meters MA = 4 m/0.5 m = 2

7. Wedge  a device that is thick at one end and tapers to a thin edge at the other end.

8. Mechanical advantage Length of wedge Width of wedge MA =? 10 cm / 2 cm = 5 10 cm 2 cm

9. Screws  inclined plane wrapped around a cylinder.

10. Mechanical advantage Length around the threads Length of the screw 5 cm Thread length = 60 cm MA = 60 cm / 5cm = 12

11. Levers  a ridged bar that is free to pivot, or rotate, on a fixed point.

12. Mechanical Advantage Distance from fulcrum to input force Distance from fulcrum to output force 10 cm 50 cm What is the mechanical advantage? MA = 50 cm/ 10 cm MA = 5

13. Classification of Levers  according to the location of the fulcrum relative to the input and output forces.

16. - Simple Machines Simple Machines in the Body  Most of the machines in your body are levers that consist of bones and muscles.

17. Wheel and Axle  made of two circular objects fastened together that rotate about a common axis.

18. Pulley  made of a grooved wheel with a rope or cable wrapped around it.

19. Wheel and axle Simple Machine Mechanical Advantage Example Inclined plane Length of incline ÷ Height of incline Ramp Radius of wheel ÷ Radius of axle Screwdriver Wedge Length of wedge ÷ Width of wedge Ax Screw Length around threads ÷ Length of screw Screw Lever Distance from fulcrum to input force ÷ Distance from fulcrum to output force Seesaw Pulley Number of sections of supporting rope Flagpole

20. Compound Machines  A compound machine is a machine that utilizes two or more simple machines.