Chapter 4: Energy

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transfer of energy

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24 Terms

1

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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2

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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3

Conservative forces

________ are forces that do not dissipate energy and do not depend on the path taken by the object.

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4

Power

________ is the rate at which work is done or energy is transferred.

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5

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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6

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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7

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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8

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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9

pulling in two dimensions

no vertical work because no accomplishment/movement

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10

when will work be negative

when a force is acting in the direction opposite to the direction of motion

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11

area under the curve is work

area under the curve is work

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12

the work done to lift something

you give an object precisely that much gravitational potential energy

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13

pe grav equation

pe=mgh

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14

pushing a crate horizontal

angle is 0 degrees cos 0=1

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15

work to make something move

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16

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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17

mass is doubled, kinetic energy is

doubled

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18

if speed is doubled, kinetic energy is

4 times as much capable of doing 4 times as much work

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19

kinetic energy of a group of objects

sum of kinetic energies of individual objects

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20

hooke's law equation

f=kx

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21

net work in relation to kinetic energy

=1/2 mvinitial squared-1/2 mvfinal squared equals change in kinetic energy

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22

forces for which work done does not depend on path taken but on initial and final positions

conservative forces gravity

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23

roller-coaster

assuming no energy work done getting car up=potential gravitational energy at the top=kinetic energy at bottom

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24

energy losses

multiply loss by height before subtracting because loss is in n/m

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