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m&m 3.4

Solids at Work

QuestionAnswer
Work The movement of an object by force. Force x distance, measured in foot-pounds
Joule The metric unit of work and energy
Time An important element in the accomplishment of mechanical work. Inversely related to power
Power The rate of doing work. Work/time
Horsepower Lifting 550 pounds in one foot in one second. James Watt
Machines Devices for doing work and to multiply muscle power
Simple machines Basic force-multiplying machines. Helps us by multiplying force applied to them, changing the direction of the force applied to them, multiplying the speed or distance that the applied force moves something
Effort The force we apply to the machine
Resistance The force the machine helps us overcome
Mechanical advantage (MA) Tell us the number of time a machine multiplies our efforts.
MA=R/E Mechanical Advantage= Resistance force/Effort force
Work input The work put into a machine. The product of the effort force times the distance the effort is exerted. Always greater than work output
Work output The work received from a machine. The product of the resistance force times the distance the resistance is moved
Law of work The work put into a machine is equal to the work received from the machine
Six simple machines Lever, wheel and axle, pulley, inclined plan, wedge, screw
Lever One of the most versatile of all simple machines. Can multiply force or speed without changing direction of effort
Work efficiency Efficiency=work output/work input x 100%. Friction reduces work output
Created by: Jer Stephens
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