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Chapter 4 Work and machines
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Gravity
Terms in this set (24)
Work
Force exerted on an object that causes it to move.
Joule
A unit of work equal to one Newton-meter.
Machine
A device that changes the amount of force exerted or the direction in which force is exerted.
Input force
The force exerted on a machine.
Output force
force exerted on an object by a machine.
Mechanical advantage
The number of times the force exerted on a machine is multiplied by the machine
Efficiency
The percentage of the input work that is converted to output work.
Actual mechanical advantage
The mechanical advantage that a machine provides in a real situation.
Ideal mechanical advantage
The mechanical advantage that a machine would have without friction.
Inclined plane
A flat surface with one end higher than the other.
Wedge
An inclined plane that moves.
Screw
An inclined plane wrapped around a central cylinder to form a spiral.
Lever
A rigid object that pivots about a fixed point.
Fulcrum
The fixed point around which a lever pivots.
Wheel and axle
Two circular or cylindrical objects that are fastened together and rotate about a common axis.
Pulley
A grooved wheel around which is wrapped a rope, chain, or cable.
Compound machine
A device that combines two or more simple machines.
Gears
Two or more wheels linked together by interlocking teeth.
formula for work
W = Fd or W = force X distance
formula for efficiency
eff = (output work/input work) X 100%
formula for mechanical advantage using force
MA = output F/input F
formula for mechanical advantage using distances
MA = input d/output d
Watt
Unit if power, equal to I joule of work per second.
Power
The rate at which work is done. P = (force X distance)/time or P = work/time
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