Chapter 4: Energy
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24 Terms
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transfer of energy
Work is defined as the ________ when a force is applied to an object and causes it to move.
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potential energy
The ________ associated with a conservative force can be calculated using the formula: PE=- Wc, where Wc is the work done by the conservative force and PE is the ________.
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Conservative forces
________ are forces that do not dissipate energy and do not depend on the path taken by the object.
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Power
________ is the rate at which work is done or energy is transferred.
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Work can be calculated using the formula
W = F x d x cos(theta), where F is the force applied, d is the distance moved, and theta is the angle between the force and the displacement vectors
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Power can be calculated using the formula
P = W/t, where W is the work done and t is the time taken
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The work-energy theorem can be written as Wnet = KEf
KEi, where Wnet is the net work done, KEf is the final kinetic energy, and KEi is the initial kinetic energy
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The potential energy associated with a conservative force can be calculated using the formula
PE = -Wc, where Wc is the work done by the conservative force and PE is the potential energy
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pulling in two dimensions
pulling in two dimensions
no vertical work because no accomplishment/movement
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when will work be negative
when will work be negative
when a force is acting in the direction opposite to the direction of motion
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area under the curve is work
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area under the curve is work
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the work done to lift something
the work done to lift something
you give an object precisely that much gravitational potential energy
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pe grav equation
pe grav equation
pe=mgh
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pushing a crate horizontal
pushing a crate horizontal
angle is 0 degrees cos 0=1
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work to make something move
acceleration w=fd w=mad
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if negative net work is done
body's kinetic energy decreases by an amount W net force exerted on a body opposite to the body's direction of motion reduces speed and kinetic energy
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mass is doubled, kinetic energy is
doubled
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if speed is doubled, kinetic energy is
if speed is doubled, kinetic energy is
4 times as much capable of doing 4 times as much work
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kinetic energy of a group of objects
kinetic energy of a group of objects
sum of kinetic energies of individual objects
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hooke's law equation
hooke's law equation
f=kx
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net work in relation to kinetic energy
net work in relation to kinetic energy
=1/2 mvinitial squared-1/2 mvfinal squared equals change in kinetic energy
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forces for which work done does not depend on path taken but on initial and final positions
forces for which work done does not depend on path taken but on initial and final positions
conservative forces gravity
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roller-coaster
assuming no energy work done getting car up=potential gravitational energy at the top=kinetic energy at bottom
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energy losses
energy losses
multiply loss by height before subtracting because loss is in n/m
Note 
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