Work & Machines

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Chapter 4

100% efficiency

Fulcrum

fixed point that a lever rotates around

Compound Machines

combination of simple machines

Elbow

acts as the fulcrum when bending your arm

door knob

chisel

block & tackle

sliding board

broom

light bulb

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.

Work

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

Great Pyramids

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

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