Chapter 4 Review
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16 Terms
Horsepower
A unit of power equal to 746 watts
Power
The rate of doing work
Work
Force multiplied by distance
Watt
The measurement unit of power equal to one joule of work performed in 1 second
Simple machines
A mechanical device that accomplishes a task with only one movement (exerts force over a distance) ex: gear, ramp, lever, screw, rope, pulley,
Input
Everything you do to make the machine work
Output
What the machine does for you
Mechanical Advantage
the ratio of the output force to the input force Output force/Input force
Machine
A device with moving parts that work together to accomplish a task
Fulcrum
The pivot point of a lever
Input arm
The side of a lever where the input force is applied
Tension
The pulling force in a rope
Efficiency
The ratio of work output to work input that is expressed as a percent (work is always lost due to friction)
Irreversible
A process with less that 100% efficiency
Why are work and energy both measured in joules?
Work is the transfer of energy
In which direction should you apply a force if you want to do the greatest amount of work?
the same direction as the motion