Forces What is a Force? Push or Pull What does it do? Causes Motion How do we describe it? Size (magnitude) Direction.

ForcesWhat is a Force?

Push or Pull

What does it do?

Causes Motion

How do we describe it? Size (magnitude) Direction

What are the 7 simple machines?

• Lever• Inclined Plane Wedge Screw• Wheel and Axle Gear Pulley

Why do we use simple machines?

• To make life easier!

• Simple Machines change forces:

change the direction

change the size

change both

How do they work?

• Conservation of Energy Work and Energy are related

• Scientific Definition of Work

Work = Force x Distance distance in direction of force

Lever

Incline Plane

Wedge

Screw

Wheel and Axle

Gears

Pulley

Change Force Direction

Same Force Size