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physics gcse > motion > Flashcards

motion Flashcards

1
Q

scalar quantity

A

described by only its size or magnitude

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2
Q

vector quantitiy

A

described by magnitude and direction
(often shoen using arrows)

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3
Q

distance and unit

A

how far an object has travelled in total
meters

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4
Q

displacement
[unit]

A

how far an object has moved from its starting position in a particular direction
[meters]

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5
Q

unit for speed

A

m/s

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6
Q

formula for speed

A

speed=distance moved/time taken

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7
Q

is direction a scalar or vector

A

scalar

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8
Q

equations for average speed

A
  • average speed=total distance/total time (uniform acceleration)
  • average speed= inital speed + final speed/2 (u+v/2)
  • rate of change of speed=final speed-inital speed/time (v-u/t)
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9
Q

is speed a scalar or vector

A

scalar

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10
Q

velocity

A

distance travelled in a certain direction in a certain direction in unit time

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11
Q

is velocity a scalar or vector

A

vector

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12
Q

velocity units

A

m/s

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13
Q

velocity equation

A

velocity=displacement/time

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14
Q

is displacement a vector or scalar quantity

A

vector

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15
Q

is acceleration a vector or scalar quantity

A

vector

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16
Q

is rate of change of speed a vector or scalar quantity

17
Q

average velocity

A

-average velocity=displacement/total time
-average velocity=initial velocity
+ final velocity/2 (u+v/2)
-rate of change of velocity= final velocity - initial velocity/time taken (v-u/t)

18
Q

another word for rate of change of velocity

A

acceleration

19
Q

acceleration

A

the rate of change of velocity of a body

20
Q

formula for acceleration

A

acceleration=change in velocity/time for change (a=v-u/t)

21
Q

units for acceleration

22
Q

distance-time graphs

A
  1. if line is horizontal the object is stationary
  2. steady gradient=steady speed
    3.steeper the gradient= faster the object is moving
  3. curve means getting faster (accelerating)
23
Q

displacement-time graphs what does the gradient mean

A

the velocity

24
Q

displacement-time graphs

A
  1. curve= acceleration
  2. steady gradient=constant velocity
25
Q

how do u fine out the velocity of an object from a displacement-time graphs

A

draw a tangent (rise/run)

26
Q

speed time graphs

A
  1. horizontal line= steady speed
  2. constant upwards gradient= acceleration
  3. constant downwards gradient= deceleration
27
Q

area under speed time graph=

A

distance travelled

28
Q

gradient of line of speed time graph=

A

rate of change of speed

29
Q

velocity time graphs

A

constant velocity= constant acceleration

30
Q

what does the gradient of velocity time graphs tell us

A

acceleration

31
Q

area under velocity time graphs tells us

A

displacement

32
Q

equations of motion

A
  1. v = u + at
  2. v2 = u2 +2as
  3. s = ut + 1/2at2
  4. s= 1/2(u+v)t

physics gcse (7 decks)

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