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measured by a change of position
speedometer of an object relative to
other objects over time

describes quickness S m/s
of motion v = t

textbooks nis edu kz
speed – v an object covers equal
distances at equal time
intervals
metre

distance
uniform

scalar quantity MECHANICAL S, m v 1

MOTION v 2
the length of a
trajectory t, s
vector
quantity
speed does not
S=S 1 +S 2 +S 3 +…+S n
change over time

displacement – S examples v, m/s

t, s
a direct line
connecting initial
and final positions
of an object

distance equals
displacement if motion man on escalator
is on a straight line
(trajectory) S=S
a person with a parachute
descending near the
distance is greater than
displacement if motion is Earth’s surface – no wind
on a curved trajectory S>S

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