MACHINES

• The earliest machines were very simple devices such as a rod to pry a rock out of the ground.

• Ramps helped the pyramid builders in Egypt raise rocks for buildings.

• A simple axe would split wood. A spear would kill an animal.

The first machines all had two things in common:

• 1. They were designed to meet human needs (shelter, food, water, etc.)

• 2. They all required human or animal power to work.

Advancements in technology lead to the invention of more efficient machines:

• 1. Water and bucket• 2. Water well• 3. Mill wheel• 4. Archimedes screw• 5. Motorized pumps

• Each time an advancement is made, the goal is to make things EASIER and FASTER

SIMPLE MACHINES

• A simple machine is any tool or device that is designed for ONE BASIC FUNCTION

• There are 6 basic simple machines– Lever– Pulley– Inclined Plane– Wheel and Axle– Screw– Wedge

But there are pros and cons to everything:

Simple Machine Pros (Advantages) Cons (Disadvantages)

HOMEWORK!!

• 1. Fill in pros and cons chart based on information on pages 262 – 265 in your textbook.

• 2. Answer Check and Reflect Questions on page 268: 1, 2, 4

• You will need to READ THE PAGES in order to complete your homework assignment.