Introduction to Simple Machines. - ppt download

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What are they? Simple machines are machines with few or no moving parts that are used to make work easier
Introduction to Simple Machines
Simple machines are machines with few or no moving parts that are used to make work easier.
Wedge. Wheel and Axle. Lever. Inclined Plane. Screw. Pulley.
Examples: axe, doorstop, chisel, nail, saw, jackhammer, bulldozer, snow plow, horse plow, zipper, scissors, airplane wing, knife, fork, bow of a boat or ship.
Examples: car, bicycle, office chair, wheel barrow, shopping cart, hand truck, roller skates.
Examples: see-saw, dump truck, broom, crane arm, hammer claw, crow bar, fishing pole, screwdriver, bottle opener.
Examples: highway or sidewalk ramp, stairs, inclined conveyor belts, switchback roads or trails.
Takes many twists to go a short distance. Holds things together. Examples: screws, bolts, clamps, jar lids, car jack, spinning stools, spiral staircases.
Examples: flag pole, elevator, sails, fishing nets, clothes lines, cranes, window shades and blinds, rock climbing gear.
For the mechanical advantage… Making something easier to do, but it takes a little longer to do it. For example, going up a longer flight of stairs instead of going straight up a ladder.
Crane or tow truck combines lever and pulley. Wheel barrow combines wheel and axle with a lever.
Pushes material apart, cuts. Wheel and Axle. Makes it easy to move things by rolling them, and reducing friction. Lever. Helps lift heavy weights using longer distances. Inclined Plane. Makes it easier to move objects upward; a longer path, but easier lifting. Screw. Turns rotation into lengthwise movement. Pulley. Makes lifting heavy weights easier by redirecting force.