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What is 1 + 3?
Work & Machines
fixed point that a lever rotates around
combination of simple machines
acts as the fulcrum when bending your arm
Wheel & Axle
block & tackle
3 Ways Machines Make Work Easier
1. changing the amount of force you exert. 2. the distance over which you exert force. 3. the direction in which you exert force.
1. force must be applied to object
2. object must move same direction as force
100 % Efficiency?
Not possible - some work is wasted due to friction
simple machines: wedges & inclined planes
W = Force x Distance
50 N box pushed 10 meters
W = 50 x 10; W = 500 N/M
P = W/T
takes 10 sec. to move the box
P = 500/10; P = 50 W