1. Welcome Back Minions!!!
Warm up on the board…

2. Effort & Load Effort Load Force applied to an object.
The opposition to applied force, such as a weight to be carried or moved.

3. Simple Machines… 6 types of “Simple Machines” Inclined Plane Wedge
Levers (3 classes)  Today!!!
Screw
Wheel & Axle
Pulley (3 classes)

4. Opener for Levers
Give me a lever long enough and a fulcrum on which to place it, and I shall move the world. -Archimedes (btw… the lever would have to be around 100,000,000,000,000,000,000,000 meters long and moved 100,000,000,000,000,000,000 meters down just to budge the Earth about 1mm!!!!!)

5. Where have you seen levers before?
So what is a lever?
Lever
A rigid bar that is free to pivot, or rotate, on a fixed point.

6. Parts of a Lever Fulcrum Input Force Output Force
Fixed point that a lever pivots around
Input Force
The force exerted to the machine
Output Force
The force exerted from the machine to the object it acts upon

7. Power of 3… 3 Classes of Levers All depends on the fulcrum!
First Class Levers
Second Class Levers
Third Class Levers
All depends on the fulcrum!

8. First Class Lever First Class Lever
Always changes the direction of the force.
Fulcrum closer to output force; the lever increases force.
Fulcrum closer to input force; the lever increases distance.

9. Give me examples… First Class Levers Seesaws crowbar scissors
an oar attached to a boat
a claw hammer
trebuchet siege weapon

10. Second Class Lever Second Class Lever
Increase force but do not change the direction of the force.

11. Give me examples… Second Class Lever wheel barrow hole puncher Stapler
nutcracker
bottle opener
nail clippers
paper cutter

12. Third Class Lever Third Class Lever
Increases distance, but do not change the direction of the force.

13. Give me examples… Third Class Lever Baseball bat Broom Doors
Fishing rod
Tweezers
Mouse trap
Catapult

14. Lever – Mechanical Advantage
Increases input force
Change direction of Input force

15. Simple machines in the body…
Some of you wondered about this…

16. Which Class Lever is it??? Seesaws Tweezers crowbar hole puncher
Stapler
Mouse trap
nutcracker
bottle opener
Scissors
Fishing rod
Trebuchet
Catapult
1st Class Lever
3rd Class Lever
2nd Class Lever