the transfer of energy that occurs when a force makes an object move
work
a device that makes doing work easier
machine
the baseball bat is an example of
third class lever
a grooved wheel with a rope
pulley
what are the two conditions for work to be done on an object
force must be applied to move and in direction as applied force
how do machines make work easier (3 ways)
increasing force, force v distance, change direction
the screwdriver to open a paint can is an example of
first class lever
consisting of a shaft or axel attached to a wheel
wheel and axel
equation for work
work (joules) = appled force (newtons) x distance (meters)
W = Fd
the force applied by the machine
output force
the wheelbarrow is an example of
2nd class lever
a sloping surface that reduces the amount of force required to do work
inclined plane
the amount of work done in one second
power
the force applied to the machine
input force
a bar that is free to pivot or turn at a fixed point
a lever
an incline plane wrapped in a spiral
the screw
equation for power
P = W/t
Power (Watts) = work(joules)/time(seconds)
a measure of how much of the work put into a machine is changed into useful output
efficiency
the point of pivot for a lever
fulcrum
inclined plane with one or two sloping sides
the wedge