Displacement - Distance travelled in a particular direction.

Velocity - Distance travelled in a certain direction in 1 second.

Speed - Distance travelled in 1 second.

Acceleration - The change in velocity in 1 second.

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Mechanics - Kinematics 2.1.2

Instantaneous values of speed, velocity and acceleration is the value at a single moment in time, not over a period of time. Average values of all three are the average values of the speed/velocity/acceleration over a certain period of time, not just a single moment.

Average velocity is the difference between the beginning and the end.
e.g. distance = 16km, journey time = 4 hours
average velocity = 16/4
= 4 km h^-1

Average velocity = displacement/time

Average speed = distance/time

Average acceleration = change in velocity/change in time unit of acceleration is m s^-2 Acceleration is a vector quantity

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Mechanics - Kinematics 2.1.3

The equations of uniformly accelerated motion can only be under conditions where the acceleration is constant.

SUVAT used for uniformly accelerated motion:

v = u + at

s = (u + v/2) t

v^2 = u^2 + 2as

s = ut + 1/2at^2

s = vt - 1/2at^2

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Mechanics - Kinematics 2.1.6

Air resistance eventually affects all objects that are in motion. Due to the effect of air resistance objects can reach terminal velocity. This is a point by which the velocity remains constant and acceleration is zero.

In the absence of air resistance all objects have the same acceleration irrespective of its mass.

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Physics

Instantaneous velocity is how fast it’s going at that moment in time and in which direction.

Average velocity is the difference between the beginning and the end.
e.g. distance = 16km, journey time = 4 hours
average velocity = 16/4
= 4 km h^-1

average velocity = displacement/time

Instantaneous velocity = length/time for object to pass

Acceleration = change of velocity/time
unit of acceleration is m s^-2
Acceleration is a vector quantity

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