1. Where can one find simple machines?

2. Simple Machines-
Machine that does work with only one movement of that machine

4. Mechanical Advantage Problem
A crate of bananas weighing 3000 N is shipped from South America to New York, where it is unloaded by a dock worker who lifts the crate by puling with a force of 200 N on the rope of a pulley. What is the actual mechanical advantage of the system? 15
Is that a good machine?

5. Remember: Work Input = Work Output
F x d = F x d
What you gain in force, you lose in distance!
****A machine will never put out more work than put into it!!!!!****

7. Sample Problem
2. A pair of scissors can cut through paper with a force of 125 Newtons
moving 1 millimeter. The force required by your hand is only 25 N.
How far must the handles of the scissors move?
5 millimeters
What is the mechanical advantage of the scissors? 5
Which GENERAL type of simple machine is the scissors?
(circle one) LEVER or INCLINED PLANE

8. Compound Machine
Two or more simple machines that operate together