Presentation on theme: "Mr. Johnson Perrysville Junior High Updated 2-3-2010."— Presentation transcript:
Mr. Johnson Perrysville Junior High Updated
Terms To Know Work – done when an applied force causes an object to move in the direction of the force Energy – ability to cause change; speed, force, shape, or temperature Load – weight being moved Effort - force placed on an object that cause it to move.
What is a Simple Machine? Tool used to make work easier Few moving parts Increased mechanical advantage Increase magnitude of out put force w/ cost of increased distance moved
Inclined Plane Inclined plane is a surface set at an angle, against a horizontal surface. Use less force over a longer distance to raise an object Object moves, not inclined plane
Wedge Similar to Inclined Plane Does work by moving More acute the angle of the wedge, the more mechanical advantage it will have.
Screw A screw is a helical inclined plane A screw converts a rotational force, torque, into a linear force
Pulley Used to change the direction of an applied force Realize a mechanical advantage in either a linear or rotational system of motion.
Wheel and Axle Wheel & axles multiply the applied force OR distance traveled. Larger diameter wheels exert stronger forces on axles
1 st Class Lever fulcrum is located between the input effort and the output load
2 nd Class Lever fulcrum is at one end, and the applied force at the other, with the load in between Load moves the same direction as the applied force
3 rd Class Lever Input effort is higher than the output load Applied force is between fulcrum and load Moves Faster