1. Simple Machines Chap 12-2

2. 6 Simple machines 2 families Levers and Incline Plane 2 families Levers and Incline Plane 1- Lever (3 classes) 1- Lever (3 classes) 2- Pulley 2- Pulley 3- Wheel and Axel 3- Wheel and Axel 4- Incline plane 4- Incline plane

3. 6 Simple machines 5- Wedge 5- Wedge 6- Screw 6- Screw Definition- Basic form of machine that can be combined to form a compound machine Definition- Basic form of machine that can be combined to form a compound machine

4. Levers All levers have a ridged bar that is free to move about the fulcrum (fixed point) when effort is applied All levers have a ridged bar that is free to move about the fulcrum (fixed point) when effort is applied

5. Levers continued 1 st class has effort (e) then fulcrum (f) then the resistance (r) such as a Tire iron 1 st class has effort (e) then fulcrum (f) then the resistance (r) such as a Tire iron

6. Levers continued 2 nd class levers has fulcrum (f) then the resistance (r) then the effort such as a wheelbarrow 2 nd class levers has fulcrum (f) then the resistance (r) then the effort such as a wheelbarrow

7. Levers continued 3 rd class levers has fulcrum (f) then the effort (e) then the resistance (r) such as a fishing pole 3 rd class levers has fulcrum (f) then the effort (e) then the resistance (r) such as a fishing pole

8. Pulleys Chain, belt or rope wrapped around a fixed grooved wheel. Chain, belt or rope wrapped around a fixed grooved wheel. A type of lever where the middle of pulley acts like the fulcrum A type of lever where the middle of pulley acts like the fulcrum

9. Pulleys con’t Pulley can increase the mechanical advantage many time depending on how many weight supporting ropes (figure 6) Pulley can increase the mechanical advantage many time depending on how many weight supporting ropes (figure 6)

10. Wheel and axle 3 rd type of lever class 3 rd type of lever class A Lever or pulley (wheel) connected to a shaft (axle) A Lever or pulley (wheel) connected to a shaft (axle) 2 different circular objects with different diameters 2 different circular objects with different diameters

11. Incline plane family A slanted surface that changes the size and direction of the force needed. Longer ramp = less force needed A slanted surface that changes the size and direction of the force needed. Longer ramp = less force needed

12. Wedge Is a modified incline plane or 2 incline plane back to back such as a ax blade or nails (tips) Is a modified incline plane or 2 incline plane back to back such as a ax blade or nails (tips) Turns 1 downward force into 3 side directed forces Turns 1 downward force into 3 side directed forces

13. Screw An incline plane wrapped around a cylinder. An incline plane wrapped around a cylinder. The gentle sloping threads requires small force to move. The gentle sloping threads requires small force to move.

14. Compound Machines 2 or more simple machines combined together such as a bicycle- wheel and axle and levers. 2 or more simple machines combined together such as a bicycle- wheel and axle and levers.