Physical Science Exam: definitions and Formulas

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45 Terms

1

motion

An object's change in position relative to a reference point.

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2

frame of reference

a system for specifying the precise location of objects in space and time

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3

distance

measures the path taken

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4

displacement

the change of an object's position

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5

speed

the distance traveled divided by the time interval during which the motion occurred

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6

velocity

the speed of an object in a particular direction

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7

constant speed

equal distances in equal amounts of time

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8

instantaneous speed

the speed at a given time

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9

acceleration

the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change

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10

inertia

the tendency of an objects to resist a change in motion unless an outside force acts on the objcet

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11

weight

A measure of the gravitational force exerted on an object.

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12

mass

A measure of the amount of matter in an object

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13

free fall

the motion of a body when only the force of gravity is acting on the body.

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14

terminal velocity

the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity.

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15

momentum

quantity defined as the product of the mass and velocity of an object.

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16

work

the transfer of energy to an object by using a force that causes the object to move in the direction of the force

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17

power

A quantity that measures the rate at which work is done or energy is transformed

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18

mechanical advantage

A quantity that expresses how much a machine multiplies force or distance.

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19

energy

the capacity to do work

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20

potential energy

the energy that an object has because of the position, shape, or condition of the object.

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21

kinetic energy

the energy of an object due to the object's motion

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22

mechanical energy

the amount of work an object can do because of the object's kinetic and potential energies

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23

efficiency

a quantity, usually expressed as a percentage, that measures the ratio of useful work output to work input

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24

absolute zero

The temperature at which molecular energy is at a minimum

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25

heat

The energy transferred between objects that are at different temperatures

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26

temperature

A measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particles in an object.

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27

thermal conduction

the transfer of energy as heat through a material

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28

convection

The movement of matter due to differences in density that are caused by temperature variations

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29

convection current

any movement of matter that results from differences in density; may be vertical, circular, or cyclical

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30

radiation

the energy that is transferred as electromagnetic waves, such as visible light and infrared waves

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31

celcius to farenheit

F=1.8(C)+32

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32

farenheit to celcius

C = (F-32)/1.8

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33

Kelvin to Celsius

C = K - 273

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34

Velocity

distance/time

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35

distance formula

velocity x time

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36

time

distance/velocity

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37

acceleration formula

a=vf-vi/t

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38

force

mass x acceleration

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39

mass formula

force/acceleration

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40

work formula

force x distance

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41

force formula

work/distance

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42

Power formula

work/time

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43

kinetic energy formula

KE=1/2mv^2

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44

potential energy formula

mgh (mass x gravity x height)

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45

efficiency formula

Work output/work input x 100%

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