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Work and machines
Tools
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Work
force x distance
power
work / time
Joule
unit of work
Watt
unit of power
80N x 30m
240J
250J / 25 sec
10 Watts
Mechanical advantage
output force / input force
Machine
Makes work easier
Lever
pivots at fixed point
inclined plane
ramp
wedge
double inclined plane that moves
screw
spiral inclined plane
wheel and axle
two circular objects of different sizes
pulley
grooved wheel
compound machine
2 or more simple machines
1st class lever
see saw
2nd class lever
wheel barrow
3rd class lever
hammer
Scissors
1st class lever + wedge
can opener
3rd class lever + wheel and axle
Tory Victorine
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