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
no vertical work because no accomplishment/movement
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\ 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
you give an object precisely that much gravitational potential energy
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\ pe grav equation
pe=mgh
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\ 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
4 times as much capable of doing 4 times as much work
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\ kinetic energy of a group of objects
sum of kinetic energies of individual objects
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\ hooke's law equation
f=kx
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\ 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
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
multiply loss by height before subtracting because loss is in n/m
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Flashcard (51)