Kinematics

Sorry for the wrong answers :(. All fixed now! ||| texbook references: Mike Crundell, Geoff Goodwin - Cambridge International AS & A Level Physics student's book 3rd edition |||

What is displacement

distance moved in a particular direction

what is velocity

rate of change of displacement of an object

what is acceleration

rate of change of velocity on object

what does the gradient of a displacement - time graph give

velocity

what does the sign of the gradient of a displacement - time graph mean

direction of velocity

what does zero gradient mean on displacement - time graph mean

object is at rest

what does a constant gradient on a displacement - time graph mean

object is moving at constant velocity

what does a decreasing gradient on a displacement - time graph mean

object is decelerating

what does an increasing gradient of a displacement - time graph mean

object is accelerating

what does the gradient of a velocity - time graph give

acceleration

what does the area under a velocity - time graph give

displacement

what does zero gradient on a velocity - time graph give

object moving with constant velocity

what does a constant gradient mean on a velocity - time graph give

zero acceleration

what does a decreasing gradient of a velocity - time graph give

decreasing acceleration

what does an increasing gradient of a velocity - time graph give

increasing acceleration

what is the first step of finding the gradient of a curve

find the tangent

what is kinematics about

describing the motion of objects but not the cause

how do you find an area under the curve

using geometrical shapes to estimate the area

what is a scalar quantity

A physical quantity that has only magnitude

what is a vector quantity

A physical quantity that has both magnitude and direction.

what is this graph showing?

constant velocity

what is this graph showing

decreasing velocity

what is this graph showing

non-constant accelerating velocity

what is this graph showing

zero acceleration

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constant acceleration

what is this graph showing

increasing acceleration

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B

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D

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how do you calculate speed

distance / time

what is the unit for speed

ms ^-1

how do you define speed

distance moved along the path divided by the time taken

what is relative speed

speed of an object as observed from the perspective of another moving object

how do you calculate relative speed in the same direction

v1 - v2

how do you calculate relative speed in the opposite direction

velocity 1 + velocity 2

how do you calculate velocity

change of displacement / change of time

guess the average speed of: light

3.0 × 10⁸

guess the average speed of: electron around nucleus

2.2 × 10⁶

guess the average speed of: earth around sun

3.0 × 10⁶

guess the average speed of: jet airliner

2.5 × 10²

guess the average speed of: typical car speed (80km/h)

22

guess the average speed of: sprinter

1.0 × 10¹

guess the average speed of: walking speed

1.5

guess the average speed of: snail

1.0 × 10^-3

what is quoted relative to a fixed referene

speed

how do you calculate average velocity

displacement / time

what is the average acceleration for: due to circular motion of electron around nucleus

9 × 10²⁶

what is the average acceleration for: car crash

1 × 10³

what is the average acceleration for: free fall on earth

9.81

what is the average acceleration for: family car

2

what is the average acceleration for: free fall on moon

1.6

what is the average acceleration for: an Equator, due to rotation of earth

3 × 10^-2

what is the average acceleration for: due to circular motion of earth around sun

6 × 10^-5