MACHINES Devices that make work easier by changing the size and/or the direction of the force. They will not do work for you.
SIMPLE MACHINES Machines that can do a task with one single movement.
SIMPLE MACHINES • Lever • Pulley • Wheel and Axle • Inclined Plane • Screw • Wedge
Lever • A simple machine consisting of a bar that is free to pivot (rotate) around a fixed point called the fulcrum. • Ex: scissors, crowbar
Pulley • A simple machine consisting of a grooved wheel with a rope running along the groove. • Ex: flagpole
Wheel & Axle • A simple machine consisting of two different sized wheels that rotate together. • Ex: door knob, steering wheel
Inclined Plane • A simple machine consisting of a sloping surface or ramp used to raise objects. • Ex: loading ramp
Inclined Planes • Mountain roads are inclined planes so that cars don’t have to climb straight up. A definite advantage! • Also, think about parking garages.
Screw • A simple machine consisting of a special type of inclined plane wrapped in a spiral around a cylindrical post. • Ex: spiral staircase, screw
Wedge • A simple machine consisting of a moving inclined plane with one or two sloping sides. • Ex: knife, chisel
Compound Machines • A compound machine is a combination of several simple machines. • Ex: bicycle