The 6 Simple Machines Inclined Plane Screw Pulley

The 6 Simple Machines Inclined Plane Screw Pulley Lever Wedge Wheel and Axle

Levers - Video https: //www. youtube. com/watch ? v=J 2 Nt_r. Ra 3 JY

Levers ®A lever is a ridged bar that is free to pivot, or rotate, on a fixed point.

Levers ® Levers are classified according to the location of the fulcrum (fixed point) relative to the input and output forces.

First Class Lever ® In a first-class lever the fulcrum is located at some point between the effort and resistance forces. ®A first-class lever always changes the direction of force (I. e. a downward effort force on the lever results in an upward movement of the resistance force). ® Common examples of first-class levers include crowbars, scissors, pliers, and seesaws.

Second Class Lever ® With a second-class lever, the load is located between the fulcrum and the effort force. A second-class lever does not change the direction of force. When the fulcrum is located closer to the load than to the effort force, an increase in force (mechanical advantage) results. ® Common examples of second-class levers include nut crackers, wheel barrows, doors, and bottle openers. ®

Third Class Lever ® With a third-class lever, the effort force is applied between the fulcrum and the resistance force. ® third-class levers always produce a gain in speed and distance and a corresponding decrease in force. ® Examples of third-class levers include tweezers, hammers, and shovels.

Mechanical Advantage of Levers Input force of 2 lbs. is multiplied by 4 (the IMA) and results in an output force of 8 lbs.

Wheel and Axle ® An axle attached to center of a wheel that rotate together

Wheel and Axle ® The mechanical advantage of a wheel and axle is the ratio of the radius of the wheel to the radius of the axle.

Pulleys - Video https: //www. youtube. com/watch ? v=9 T 7 t. Gos. XM 58

Pulley ®A pulley is a simple machine made of a grooved wheel with a rope or cable wrapped around it.

Pulleys – 3 types ® Fixed Pulley: changes the direction of a force; however, it does not create a mechanical advantage. ® Movable Pulley: rises and falls with the load that is being moved. A single moveable pulley creates a mechanical advantage; however, it does not change the direction of a force. ® Block & Tackle Pulley: a system of two or more pulleys with a rope or cable threaded between them, usually used to lift or pull heavy loads.

IMA= number of sections of rope supporting the object Fixed pulley IMA = 1 Moveable pulley Block and Tackle IMA = 2