force

A push or pull or turn on an object.

friction

Force created when two objects rub against each other.

bouyancy

forces

Forces for air flight

gravity

The force that pulls objects toward each other.

Simple Machines

Tools that make work easier.

6 Simple Machines

lever, pulley, screw, wheel and axle, inclined plane, wedge

screw

An inclined plane wrapped around a cylinder or cone. Commonly used to hold objects together.

pulley

A wheel that has a rope wrapped around it. Used to lift heavy objects by changing the direction or amount of the force.

inclined plane

A flat surface that is raised so one end is higher than the other. It helps move heavy objects up or down.

lever

A stiff bar that moves about a fixed point (fulcrum). It is a simple machine that is used to push, pull, or lift things.

Ramp, Stairs, Ladder

Examples of INCLINED PLANES

wheel

Examples of WHEELS

Seesaw, Crowbar, Shovel, Teeter Totter

Examples of LEVERS

Knife, Wedge, Door stop

Examples of WEDGES

Jar lid, Bolt

Examples of SCREWS

Flag Pole, Fishing reel

Examples of PULLEYS

Bicycle, Wheelbarrow, Scissors

Examples of COMPOUND MACHINES

work

The transfer of energy that occurs when a force makes an object move.

Compound Machine

A combination of two or more simple machines.

complex machines

Multiple (many different) simple and compound machines that work IN A SERIES toward a goal.

simple or compound?

A rod attached to a wheel. It makes it easier to move or turn things.