# Physics Final Exam

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## Description and Tags

### 58 Terms

1

speed

a scalar quantity that does not have a direction

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2

velocity

a scalar quantity that includes speed and direction

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3

acceleration

the change in velocity per unit of time

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4

instantaneous speed

the speed at that instant

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5

-9.8 m/s^2

when objects are free falling what is the acceleration?

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6

straight down

what is the direction of acceleration of falling objects?

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7

speed up

do objects in free fall speed up or slow down as they fall?

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8

no because the speed is always changing because of gravity

is an object that is free falling have a constant speed?

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9

zero

at the top of an objects path, the speed at the top is ____?

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10

velocity

what is the slope of a displacement time graph?

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11

acceleration

what is the slop of a velocity-time graph?

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12

displacement

what is the area under a velocity-time graph?

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13

velocity

what is the area under an acceleration time graph?

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14

independent

vertical and horizontal velocities are completely ______ of each other?

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15

45 degrees

the maximum range when an object is projected at is ___?

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16

same; slow; speed

if an object is projected at an angle the horizontal velocity is the __for the entire trip and the vertical velocity will __as it goes up and __up as it goes down.

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17

inertia

an object will remain its present state of motion unless an outside force acts on it.

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18

mass

the measure of inertia

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19

newtons 2nd law

force causes acceleration

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20

pairs

forces always come in ___?

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21

newtons 3rd law

for every action there is an opposite and equal reaction

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22

force

objects of different mass will have different weights so there is a different ___ acting on each.

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23

more

if you are in an elevator accelerating upward you would appear to weigh ___?

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24

less

if you are in an elevator accelerating downward you would appear to weigh ___?

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25

the same

if you are in an elevator moving at a constant speed you would appear to weigh ___?

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26

weightless

if you are in an elevator at free fall you would appear to be ___?

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27

frictional force

always in the opposite direction of the motion

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28

normal force

always perpendicular to the surface

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29

linear speed

the distance traveled per unit of time

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30

angular speed

the angle traveled through per unit of time

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31

tangential (linear) speed

velocity of an object in circular motion is always tangent to the circular path

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32

centripetal force

to maintain circular motion there must be a ___ directed toward the center of the path.

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33

speed; velocity

constant _ is possible during circular motion but constant _ is not possible because the direction is constantly changing which means the object is accelerating.

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34

universal law of gravitation

there is an attractive force between all objects proportional to the product of their masses and inversely proportional to the square of the distance between them. This means as the masses increase the force increase by the same factor and if the distance increases the force will decrease by the square of that factor of distance increase.

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35

joule

what are the units for work and energy?

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36

work

the force on an object times its displacement

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37

watts

what is power measured in?

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38

power

the work done per unit of time

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39

gravitational potential energy

the energy an object has due to its distance above the ground

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40

elastic potential energy

the energy due to the compression or elongation of a spring

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41

kinetic energy

the energy due to the objects speed

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42

kinetic energy

gravitational potential energy can be converted to ___ and vice versa.

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43

work

___ can be done to produce a change in kinetic energy.

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44

momentum

mass times velocity

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45

change in momentum

mass times the change in velocity

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46

momentum

____ is always conserved in collisions.

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47

elastic collision

a collision in which both the momentum and kinetic energy is conserved like billiard balls

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48

perfectly inelastic collision

collision in which momentum is conserved but kinetic energy is not and the objects stick and move together after the collision

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49

torque

force times the radius of the lever arm

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50

perpendicular; force

to get maximum torque increase the radius of the lever arm, apply force _ to the lever arm, and increase the _?

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51

wave

carries energy from one place to another

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52

period

time to complete one cycle

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53

wavelength

the distance from one wave crest to the other

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54

frequency

the amount of wave fronts or beats per second

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55

amplitude

height of the wave

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56

the doppler effect

apparent change in frequency due to the speed or source of the observer

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57

medium

sound waves require a __ to travel through

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58

frequency

beats can be heard when two tuning forks have almost the same __ and are sounded together

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