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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