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### 19 Cards in this Set

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 In order for work to be done, what can you say about the direction of the force compared to the direction of the distance? THEY MUST BE IN THE SAME DIRECTION What is the equation for work? W=F x d What is the symbol for work? W What are the units for work? J What is another way to write joule? N.m or kg.m^2/s^2 Force applied over a distance is WORK How well a machine works is EFFICIENCY What prevents a machine from having 100% efficiency? FRICTION Why can't a machine have more than 100% efficiency? LAW OF CONSERVATION OF ENERGY (ENERGY or WORK CANNOT BE CREATED OR DESTROYED) Equation for efficiency %eff = Wo/Wi x 100 Symbol for work output Wo Symbol for work input Wi Equation for work output Wo=Fo x do Equation for work input Wi = Fi x di The rate of doing work is POWER The symbol for power is P The units for power is Watts (or W) Another way to write watts is J/s or N.m/s or kg.m^2/s^3 What is the equation for power? P=W/t