Distance is a scalar quantity – it has a size but
Displacement is a vector quantity – it has both
size and direction.
Travelling from point A to point B and
returning to point A - your displacement upon
returning is zero.
Speed is a measure of how fast something
distance = average speed x time d = v x t
• Your speed at a particular instant.
• The rate at which displacement changes.
• You can drive a car at a constant speed of 60
km/h, however, every time you change
direction, your velocity changes too.
Newton’s First Law
The Law of Inertia - An object at rest will remain
at rest unless acted on by an unbalanced force.
An object in motion continues in motion with
the same speed and in the same direction unless
acted upon by an unbalanced force.
The truck has brakes, the massive rock you are
transporting does not.
Newton’s Second Law
Acceleration is produced when a force acts on a
mass. The greater the mass (of the object being
accelerated) the greater the amount of force
needed (to accelerate the object).
Force = mass x acceleration F = ma