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Level 61

Work, Energy, Power & Machines


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Efficiency
_______ compares the amount of output work to the input work.
Fulcrum
The CENTER POINT in which a LEVER is rotated which. (Also known as PIVOT).
Joule
What is the SI unit for energy?
kinetic energy (equation)
1/2 mass x speed^2
law of conservation of energy
Energy cannot be created or destroyed.
lever
a rigid bar or board that is free to move around a fixed point called a fulcrum
Machine
A device that makes doing work easier.
theoretical mechanical advantage
input distance / output distance
Mechanical Energy
The total energy an object has because of its motion or position. PE + KE
mgh
gravitational potential energy (equation)
power (equation)
work done / time interval
pulley
a grooved wheel with a rope running along the groove
Watt
A measure of power equal to one joule of work per second.
work (equation)
force x distance
impulse (equation)
force x time
actual mechanical advantage
load / effort
momentum
(p) vector quantity describing the quantity of motion or inertia in motion. Recognizes that both mass and velocity have a part in the motion of an object and is proportional to both (is zero …
kinetic energy
a running dog
impluse
chance in momentum: (force)(time) = change in (mass)(velocity)
gravitational potential energy
an icicle hanging from a rooftop
examples of machines
ramps, levers, pulleys
work
a force acting upon an object to cause a displacement. (key words: force, displacement, and cause)
three ways an object's energy changes
speed up, lift up, heat up
Power
(physics) the rate of doing work