Science - Simple Machines

friction

A force that slows objects down when they rub against each other.

inclined plane

A plane that has one end higher than another end.

force

A push or pull on an object.

wedge

A simple machine that is wide at one end and pointed at the other to help cut or split other objects. Two inclined planes that come to a point to make lifting or splitting easier.

lever

A stiff bar that moves about a fixed point (fulcrum). A bar that pivots on a *fulcrum.*

pulley

A wheel with a groove for a rope that is used for lifting.

screw

An inclined plane wrapped around a shaft or cylinder or pole.

plane

Any flat surface.

fulcrum

The fixed point around which a lever pivots. A point which a lever rests.

Simple Machine

Tools that make work easier. Something that makes work easier and faster.

gear

Wheels with teeth that fit together.

work

When a force moves an object.

wheel and axle

a circular disk with a rod through its center to move loads.

hammer

example of a lever - a flat board or bar that rests on another object, called a fulcrum, that helps us use less force to move a heavy object

boat

example of a pulley - make of a wheel and a rope, the pulley helps raise or lower items or heavy loads

jar lid

example of a screw - an inclined plane, thread, wrapped around a cylinder

ramp

example of inclined plane - a flat sloping surface that makes the job of moving items up or down easier

door stop

example of wedge - two inclined planes put together that push two objects apart, cut an object in half, or an object in place

fan

example of wheel and axle - a rod (axle) goes through the wheel and allows the wheel to turn to improve the ability to move objects

6 Simple Machines

lever pulley screw wheel and axle inclined plane wedge

effort

the force needed to move a load