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Physics 1 > Test 1 > Flashcards

Test 1 Flashcards

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1
Q

how do we define velocity in words

A

rate of change of position

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2
Q

which type of graph can we find velocity as the slope

A

position vs time

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3
Q

what quantity does the area under a velocity vs time graph represent

A

displacement

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4
Q

what quantity can we find as the slope of velocity vs time

A

acceleration

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5
Q

definition of acceleration

A

rate of change of velocity

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6
Q

what are the three ways that acceleration can change the velocity vector

A

magnitude
direction
both

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7
Q

what quantity does area under an acceleration vs time graph represent

A

change in velocity

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8
Q

if you have zero acceleration, what is the slope of the velocity vs time graph, what is the slope of the position vs time graph

A

linear

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9
Q

if you have non zero acceleration, what is the slope of the velocity vs time graph

A

linear

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10
Q

area under a velocity vs time graph is

A

delta X

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11
Q

slope of a velocity vs time graph is

A

acceleration

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12
Q

what is a vector

A

speed
direction
ex= velocity

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13
Q

for motion diagrams, dots further apart=

A

object moving faster

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14
Q

for motion diagrams, dots closer together=

A

object moving slower

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15
Q

long arrow in motion diagram=

A

faster motion

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16
Q

short arrow in motion diagram=

A

slower motion

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17
Q

constant velocity motion diagram

A

dots evenly spaced and arrows same length

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18
Q

acceleration motion diagram

A

dots get farther apart as object moves faster and velocity arrows get longer

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19
Q

deacceleration motion diagram

A

dots get closer together as object slows down and velocity arrows get shorter

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20
Q

when is velocity slope

A

position vs time graph

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21
Q

if delta X is getting smaller, what happens to velocity

A

gets smaller and smaller

22
Q

what do curves mean in a position vs time graph

A

indicates change in velocity

23
Q

can you have a positive acceleration and be slowing down

A

yes

24
Q

can you have a negative acceleration and being speeding up

A

yes

25
Q

how can acceleration cause velocity changes

A

numeric value
direction
both

26
Q

when accelerating, velocity and acceleration vectors are

A

same direction

27
Q

when decelerating, velocity and acceleration vectors are

A

opposite direction

28
Q

for a motion diagram, when moving to the left you have a

A

negative velocity

29
Q

for a motion diagram, when moving to the right you have a

A

positive velocity

30
Q

for a motion diagram, if you throw something up, what is true about its velocity and position

A

both are positive

31
Q

what is the acceleration during free fall

A

gravitational acceleration
9.8 m/s^2

32
Q

what direction do we assign acceleration

A

downward
9.8 downward

33
Q

when something in the air, what happens to velocity and acceleration

A

velocity changes, but not acceleration

34
Q

because of symmetry, what happens to time up and time down

A

if object returns to same height it started then time up=time down

35
Q

how do you solve for free fall

A

find t(top)- time to y(max)
find y max
find t down
find velocity average

36
Q

sign for vectors in Q1

A

positive

37
Q

sign for vectors Q2

A

negative

38
Q

sign for vectors Q3

A

positive

39
Q

sign for vectors Q4

A

negative

40
Q

what is acceleration assigned to x direction (projectile)

A

0 m/s^2

41
Q

what is acceleration assigned to y direction (projectile)

A

9.8 m/s^2 down

42
Q

what is the total velocity of a projectile

A

combined velocities of the x and y
- never zero unless it hits the ground

43
Q

when we launch something at an angle, what is the first thing we do with the initial velocity (projectile)

A

break initial velocity into components

44
Q

at what point in the path does vy=0 for projectile

A

at the top of the path

45
Q

what path shape does projectile take

A

parabolic

46
Q

what happens to the velocity in the y direction when something is thrown in the air (projectile)

A

slows down
comes to a stop
begins to speed up in downward direction

47
Q

what is a projectile

A

object moving in two dimensions under only the influence of Earth’s gravity

48
Q

if launched straight up in projectile, what is angle

A

90 degrees

49
Q

if launched horizontally in projectile, what is angle

A

0 degrees

50
Q

in projectile, when are you moving the fastest

A

when something is launched

51
Q

what are the signs for velocity and acceleration when an object is slowing down

A

negative v
positive a

52
Q

what are the signs for velocity and acceleration when an object is speeding up

A

positive V and positive A
negative V and negative A

Physics 1 (2 decks)

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