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physics > kinematics > Flashcards

kinematics Flashcards

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1
Q

kinematics

A

the concepts needed to describe motion

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2
Q

dynamics

A

the effect that forces have on motion

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3
Q

scalar

A

quantities that only describe magnitude

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4
Q

magnitude

A

how much there is of something

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5
Q

vectors

A

quantities that describe both magnitude and direction

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6
Q

is 5m scalar or vector?

A

scalar

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7
Q

is 30m/s, east scalar or vector?

A

vector

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8
Q

is distance scalar or vector?

A

scalar

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9
Q

distance

A

refers to how total ground an object has covered

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10
Q

is displacement scalar or vector?

A

vector

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11
Q

displacement

A

refers to how far out of place and object is
-change in objects position

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12
Q

average speed

A

distance/time
-scalar quantity
-(m/s)

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13
Q

average velocity

A

displacement/time
-vector quantity
-(m/s)

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14
Q

acceleration

A

when a change in velocity is combined with the time at which the change occurred

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15
Q

5 kinematic variables

A
  1. displacement (x)
  2. acceleration (a)
  3. final velocity (v)
  4. initial velocity (v0)
  5. time (t)
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16
Q

when not given v0 or t0 assume?

A

0m/s and 0s

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17
Q

y-axis on distance v. time graph

A

position(displacement) or distance (m)

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18
Q

x-axis on distance v. time graph

A

time (s)

19
Q

on distance v. time graph slope =?

A

slope = velocity

20
Q

on a distance v. time graph the steeper the slope?

A

the faster velocity

21
Q

on a distance v. time graph when there is no slope?

A

velocity=0
staying still

22
Q

positive direction (d v t)

A

positive slope, moving away (right)

23
Q

negative direction (d v t)

A

negative slope, moving towards(left)

24
Q

constant velocity shown on a distance v. time graph

A

linear graph

25
Q

constant acceleration shown on a distance v. time graph

A

parabola

26
Q

constant velocity shown on velocity v. time graph

A

horizontal line

27
Q

constant acceleration shown on a velocity v. time graph

A

linear

28
Q

velocity changes when… (3 things)

A
  1. an object speeds up
  2. an object slows down
  3. an object changes directions
29
Q

on a velocity v. time graph you can see an object is slowing down because…

A

it is headed towards the x-axis
where velocity=0

30
Q

on velocity v. time graph how can you tell which direction the object is traveling?

A

if the line is above the x-axis it is traveling away from you (right) , if the line is under the x-axis it is traveling towards you(left)

31
Q

on a distance v. time graph how can you tell which direction the object is traveling?

A

positive slope= traveling away from you (right)
negative slope= traveling towards you (left)

32
Q

When asked what object is ahead or their placement on a velocity v. time graph find the ______ of both and…

A

displacement of both and the larger displacement= the further away

33
Q

area under the curve on a velocity vs time graph gives you…

A

displacement

34
Q

area under the curve on an acceleration vs time graph gives you…

A

change in speed (final velocity)

35
Q

If constant speed is used use what formula…

A

m/s= m/t
m/s= constant speed
m= distance

36
Q

an object falling for twice the time will ___ times the distance

A

4

37
Q

displacement is proportional to

A

time squared

38
Q

with air resistance an object being thrown will have _____ acceleration throughout

A

the same

39
Q

free falling acceleration equals..

A

-9.8m/s2

40
Q

constant acceleration on a distance vs time graph of an object slowing down will be…

A

will be a parabola headed towards the x- axis
ln ish

41
Q

when a distance vs time graph has a negative parabola that means…

A

positive acceleration in a negative direction

42
Q

+, +, +
+, -, +
+,+, -
+,-,-
-,+,+
-,-,+
-,+,-
-,-,-
position, velocity, acceleration

A

right, away, speeding up
right, towards, slowing down
right, away, slowing down
right, towards, speeding up
left, towards, speeding up
left, away, slowing down
left, toward, slowing down
left, away, speeding up

43
Q

when velocity and acceleration have different signs the object is

A

slowing down

44
Q

when velocity and acceleration have the same sign the object is

A

speeding up

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