Studied by 14 peopletransfer of energy
Work is defined as the ________ when a force is applied to an object and causes it to move.
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 ________.
Conservative forces
________ are forces that do not dissipate energy and do not depend on the path taken by the object.
Power
________ is the rate at which work is done or energy is transferred.
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
Power can be calculated using the formula
P = W/t, where W is the work done and t is the time taken
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
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
pulling in two dimensions
no vertical work because no accomplishment/movement
when will work be negative
when a force is acting in the direction opposite to the direction of motion
area under the curve is work
area under the curve is work
the work done to lift something
you give an object precisely that much gravitational potential energy
pe grav equation
pe=mgh
pushing a crate horizontal
angle is 0 degrees cos 0=1
work to make something move
acceleration w=fd w=mad
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
mass is doubled, kinetic energy is
doubled
if speed is doubled, kinetic energy is
4 times as much capable of doing 4 times as much work
kinetic energy of a group of objects
sum of kinetic energies of individual objects
hooke's law equation
f=kx
net work in relation to kinetic energy
=1/2 mvinitial squared-1/2 mvfinal squared equals change in kinetic energy
forces for which work done does not depend on path taken but on initial and final positions
conservative forces gravity
roller-coaster
assuming no energy work done getting car up=potential gravitational energy at the top=kinetic energy at bottom
energy losses
multiply loss by height before subtracting because loss is in n/m
Note
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