What are some simple machines? - Lever
- Incline Plane
- Pulley
Simple Machines - Multiply the effort force (allows you to use a smaller effort force to raise a heavier object).
- Change the direction of the force.
- Do not reduce the work input.
Archimedes: ”GIVE ME A PLACE TO STAND AND I WILL MOVE THE EARTH” - http://www.math.nyu.edu/~crorres/Archimedes/Lever/leverBigCorners.gif
Lever - A simple machine consisting of a rigid bar pivoted on a fixed point and used to transmit force,
- as in raising or moving
- a weight at one end
- by pushing down on the other.
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- MA= Output Force(Weight of Object)
- Input Force (Effort)
- MA shows how much you are multiplying your effort force.
What is the trade off? Ideal Mechanical Advantage - IMA= Effort Distance (din )
- Output Distance (dout )
- IMA is equal to MA in the absence of friction (ideal case).
IMA for a Lever - IMA= Effort Distance = Effort Arm
- Output Distance Load Arm
Problem Types of Levers Incline Plane - http://www.edinformatics.com/math_science/simple_machines/Inclined_plane.gif
Problem: Which has a greater IMA? Problem: Find the IMA. Pulleys Pulleys - Ideally:
- Win=Wout
- Findin= Foutdout
- IMA= din /dout =1
Combination of Fixed and Moveable Pulleys - The IMA of pulleys can quickly be found by counting the number of lifting strands.
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