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Work occurs when a force causes an object to move in the direction of the force
Work is ONLY done when ………… the force is in the same direction that the object is going
These 2 things must be present in order for work to be occurring work and force
What is the work formula ? W= F x D
What is the power formula? P= W/T
Watt include picture(s) The unit used to express power
Machine include picture(s) a device that helps make work easier by changing the size or direction of a force
Work Input the work you do on a machine
Work Output The work done by the machine
When can work output be GREATER than work input? – it can never be greater.
(carefully read last paragraph p. 193)
“Machines don’t save work” . True or false? Explain your answer False. The same work is done either way
Mechanical Advantage –tells you how many times the machine multiplies force
Mechanical Advantage formula –MA= output force/input force
What are the 6 simple machines ? Lever, screw, wedge, pulley, wheel and axle, inclined plane
Lever –simple machine consisting of a bar that pivots at a fixed point
Examples of include picture(s) see saw, kayak, wheel barrow
Fulcrum –the point on a level where the bar pivots
Examples of each of the 3 classes of levers include picture(s)
Inclined Plane simple machine that is a straight, slanted surface
How do you increase the mechanical advantage of an inclined plane? the longer the inclined plane is compared with its height, the greater the mechanical advantage
Examples of Inclined Planes include picture(s) a ramp
Wedge a double inclined plane that moves.
Examples of Wedges include picture(s) A knife
Screws an inclined plane that is wrapped in a spiral
Examples Screws include picture(s) jar lid, screw
How do you change the mechanical advantage of a screw? the longer the inclined plane the higher the mechanical advantage
Wheel & Axle a simple machine consisting of two circular objects of different sizes
Examples of Wheel & Axle include picture(s) water pump
Pulley –a simple machine consisting of a grooved wheel that holds a rope or a cable
Examples of Pulleys include picture(s) Cable cars
Created by: PhySciLewis1

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