Welcome to a world full of machines!

1
Welcome to a world full of machines!

• There are machines all around us!
• Turn to your neighbor and discuss what kinds of
  machines you saw on your way to school today.

2
The 6 Simple Machines

• All machines are made up of some of the 6 simple
  machines. They are
• Pulley
• Lever
• Wheel and axle
• Wedge
• Screw
• Inclined Plane

3
Why do we need simple machines?

• The 6 simple machines make our work easier.
• Energy is the ability to do work
• Both energy and work are measured in a unit
  called Joules.

4
Work

• The amount of Work done on an object can be
  calculated by multiplying the Force times the
  Distance.
• Work Force X Distance
• A simple machine makes work easier.

5
Lets review forces

• When a machine is used to do work, two kinds of
  forces are involved.
• The force applied to the machine is called the
  effort force.
• The force applied by the machine to act against
  another force like friction or gravity, is called
  the load or resistance.

6
The 6 Simple Machines
Inclined Plane
Pulley
Lever
Wheel and Axle
Wedge
Screw
7
The Inclined Plane

• An inclined plane is a flat, slanted surface.
• It allows you to use less effort force to move an
  object.
• Examples wheelchair ramps, driveways, skateboard
  ramps and mountain roads.

8
Pulleys

• A pulley is a grooved wheel with a rope or chain
  wrapped around it. You use the pulley by pulling
  on the rope.
• Remember, since there is a wheel in a pulley
  there also has to be an axle!
• These two men are using a pulley to help them
  lift their heavy bucket.