1. Simple Machines: lever, pulley, wheel and axle and incline Group LL

2. The Lever By Sean Rzeplinski

3. Type one lever This type of lever is a pivot point in the middle of a beam where there is a load on one side and an effort on the other. With this type of lever you can lift a larger load with less effort, but it is only moved a small distance.

4. Type two lever This type of lever has the pivot on the end with the load in between the pivot and the effort. With this type of lever you can still move a larger load with less effort

5. Type three lever This type of lever has the pivot on the end with the effort in the middle and the load on the other end. This type of lever has the effort greater than the load.

6. Pulleys

7. Pictures of Pulleys

8. What is a Pulley?  A pulley is a mechanism composed of a wheel with a groove between two flanges around the wheel’s circumference.  A rope, cable or belt usually runs inside the groove.  Pulleys are used to  change the direction of an applied force  Transmit rotational motion  Realize a mechanical advantage in either a linear or rotational system of motion

9. Equations:  Necessary Force: If there are 4 pulleys with a weight of 14 N,the weight is 2.0 N F= (14.o N + 2.0 N) :4 = 4.00 N

10. Compound Machine Different Machines: Pulleys Incline Wheel and axle

11. Compound Machine #2  Other Machines:  Pulleys  Incline  Wheel and Axle

12. Bibliography  http://library.thinkquest.org/27948/pulley. html http://library.thinkquest.org/27948/pulley. html http://library.thinkquest.org/27948/pulley. html  http://en.wikipedia.org/wiki/Pulley http://en.wikipedia.org/wiki/Pulley

13. Wheel & Axle By Olubode Afuape

14. Wheel & Axle Wheel & Axle is a simple machine. This form of a simple machine consists of a wheel that turns an axle and while it turns the wheel, a rope or string converts the rotational motion to linear motion for the purpose of moving, or lifting.

15. All wheels need an axle to function. The wheel and axle must move together for it to become a simple machine. Wheel

16. Ideal Mechanical Advantage What is the ideal mechanical advantage? Ideal mechanical advantage is the ratio of the radius of the wheel to the radius of the axle. An example would be in the picture below the, the radius of the wheel is five times larger than the radius of the axle. Therefore, the mechanical advantage is 5:1 or 5.

17. Change the Force Every simple machine changes the amount of force needed. In Wheel & axle, less energy is used to change the force, this is because the object is already rolling, allowing it to have less friction and be easier to move then when static.

18. Compound Machine List of Simple machines Pulley Wheel & Axle

19. List of Simple Machines Wheel & Axle Screw Pulley Lever

20. List of Simple Machines Wheel & Axle Pulley Screw Lever

21. Bibliography * http://en.wikipedia.org/wiki/Wheel_and_axle * http://en.wikipedia.org/wiki/Wheel_and_axle * http://classroom.jc-schools.net/coleytech/units/machines/Wheels_and_Axles.ppt#271,5,Slide 5 * * http://www.usoe.k12.ut.us/curr/Science/sciber00/8th/machines/sciber/machine7.htm * http://www.usoe.k12.ut.us/curr/Science/sciber00/8th/machines/sciber/machine7.htm http://www.worsleyschool.net/science/files/wheel/andaxle.html http://www.fi.edu/pieces/knox/automaton/wheel.htm

22. Help info Wheel and axle notion (e.g. screwdrivers, doorknobs): A wheel is essentially a lever with one arm the distance between the axle and the outer point of the wheel, and the other the radius of the axle. Typically this is a fairly large difference, leading to a proportionately large mechanical advantage. This allows even simple wheels with wooden axles running in wooden blocks to still turn freely, because their friction is overwhelmed by the rotational force of the wheel multiplied by the mechanical advantage.Wheel and axlescrewdrivers doorknobsfriction

23. Incline Incline

24. By moving an object up an inclined plane rather than completely vertical, the amount of force required is reduced, at the same time increasing the distance the object has to travel. Example: Roman soldiers built an inclined plane out of earth and clay to lay siege to the Masada in 73 b.c.

25. “Inclined Plane” An incline plane is a plane surface that is set at an angle, other than a right angle, against a horizontal surface. Examples of inclines are ramps, sloping roads, chisels, hatchets, plows, air hammers. Another common name for the incline is a ramp.

26. Force The normal force is exerted by the plane onto the body. (N) The force due to the gravity acts vertically downward (mg) And the frictional force acts parallel to the plane (F)

27. Treadmill Treadmill

29. Roller Coasters

30. http://en.wikipedia.org/wiki/Inclined_plane http://www.ac.wwu.edu/~vawter/PhysicsN et/Topics/Dynamics/InclinePlanePhys.html http://www.ac.wwu.edu/~vawter/PhysicsN et/Topics/Dynamics/InclinePlanePhys.html http://www.inclinedplane.com/