P1 Motion Flashcards

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1
Q

what is a scalar?

A

magnitude

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2
Q

what is a vector?

A

magnitude + direction

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3
Q

examples of scalar?

A

distance, speed, time

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4
Q

examples of vector?

A

displacement, velocity, acceleration, force

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5
Q

how do you calculate speed?

A

distance/time

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6
Q

how do you calculate average speed?

A

total distance/total time taken

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7
Q

how do you calculate acceleration?

A

∆v/∆t
= (v-u)/t

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8
Q

how do you calculate change in velocity?

A

∆v
= final - initial
= v-u

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9
Q

dropping objects have … acceleration

A

constant acceleration (g = 9.81)

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10
Q

how do you get velocity from a d-t graph?

A

gradient

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11
Q

d-t graph:
what does a horizontal line represent?

A

stationary

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12
Q

d-t graph:
what does a straight slope represent?

A

constant speed

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13
Q

d-t graph:
what does a curved slope represent?

A

increasing gradient - acceleration
decreasing gradient - deceleration

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14
Q

v-t graph:
what do horizontal lines represent?

A

on x-aixs - stationary
above x-axis - constant speed

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15
Q

v-t graph:
what does a up straight line represent?

A

constant acceleration

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16
Q

v-t graph:
what does a down straight line represent?

A

constant deceleration

17
Q

v-t graph:
what does a curved line represent?

A

increasing gradient - increasing acceleration/deceleration
decreasing gradient - decreasing acceleration/deceleration

18
Q

how do you get the distance travelled from a speed-time graph?

A

area under the line

19
Q

how do you get the acceleration from a speed-time graph?

A

gradient

20
Q

how do you get displacement from a v-t graph?

A

area between the line and the x-axis
•area below x-axis is (-)
•area above x-axis is (+)

21
Q

how do you get distance from a v-t graph?

A

modulus total area between the line and the x-axis

22
Q

define distance

A

scalar, total length of the path between 2 points

23
Q

define displacement

A

vector, the shortest path between two points.

24
Q

define velocity

A

speed in a given direction → s/t

25
Q

define acceleration

A

rate of change of velocity → ∆v / ∆t

26
Q

what is terminal velocity?

A

maximum velocity of an object as it falls through a fluid (eg. air)