UNIT 1 - Kinematics Flashcards

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1
Q

Define displacement

A

The shortest distance from a fixed starting point to another point in a specified direction.

(Vector quantity and has magnitude and direction)

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2
Q

Define (average) speed and the equation

A

The distance covered in a given time

Speed = distance/time
S = d/t
(or s =x/t) distance can be d or x

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3
Q

Define (average) velocity and equation

A

The change of displacement per unit time

Velocity = displacement/time
V = s/t

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4
Q

Units for speed and velocity

A

(m/s) or (ms⁻¹)
They the same

(or km/h etc)

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5
Q

What does instantaneous mean

A

When it happens at a particular time, so instantaneous speed is speed at a particular time not the average speed

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6
Q

Define acceleration and the equation and units

A

Change of velocity per unit time

acceleration = change in velocity/time taken
a= v-u/t

(m/s²) or (ms⁻²)

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7
Q

How to work out gradient

A

Rise over run

Gradient = rise/run

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8
Q

How to work out acceleration in a velocity-time graph

And velocity in a displacement-time graph

A

For velocity-time graph, gradient = rise/run = acceleration. Positive gradient is acceleration, negative gradient is deceleration.

Same for displacement-time graph, gradient = rise/run = velocity. Positive gradient = positive velocity, negative gradient = negative velocity.

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9
Q

What do the suvat symbols mean and list units

A

S = displacement (m)
U = initial velocity (ms⁻¹)
V = velocity (ms⁻¹)
A = acceleration (must be constant) (ms⁻²)
T = time taken (s)

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10
Q

What are the 4 suvat equations

A

V = u + at

S = 1/2(u + v)t

S = ut + 1/2at ²

V ² = u ² + 2as

You dont need to memorise tho, for physics

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11
Q

How to find displacement in a velocity time graph

A

The area under gradient

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12
Q

How to derive suvat??

A

Idk m8 learn it

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13
Q

Define projectile and trajectory

A

Any body given an initial velocity then follows a path determined by the effect of if gravity on that object

This path followed by the object is the trajectory

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