Types of Motion
Motion in a straight
line path. E.g. an elevator.
Curvilinear: Motion in a curved
path. A ball being thrown.
Random: A combination of the
above. A leaf in the wind.
Distance and Displacement
travelled depends on position.
Distance is a scalar quantity.
It is always positive.
E.g. d = 5 km
207, Q1. Orally,
Q. 2-5, on paper
simplest motion is straight line motion in a specific
direction at a constant speed.
When both speed and direction remain the same, it
is called uniform motion.
Speed is a scalar quantity, = distance/time.
Velocity is the vector quantity denoting speed and
Velocity is the displacement of an object per unit of
V = Δd/Δt, Δd - displacement, Δt – time interval.
motion of these particles are random
because their speed and direction
This is an example of the Kinetic Molecular
is independent and on the x-axis.
Distance depends on time and is on the yaxis.
The slope of the graph gives us the speed.
If it was a displacement-time graph, slope
would give the velocity.
209. Q 1 - 3
Experiment – Can You Walk in a
Uniform Way – Ticker Tape
is considered to be dependent
Average velocity = total displacement
Average Velocity & Speed
is done by taking the slope of a line at
two different points.
Average velocity = ∆ displacement
Unit = m/s [direction]
Average speed = ∆ distance
Unit = m/s
Velocity during uniform
acceleration can be calculated by taking
the mean of 2 velocities.
vavg = v2 + v1
P. 209, Q 1-3
Distance & Speed
already know that speed = distance
So distance = speed x time
Distance can be determined by the area
under the curve of a velocity-time graph.
is the displacement after 25 s?
213, Q. 1-5
Page 215, Q 1-4
motions can be seen easily; other
motions must be observed using other
senses or devices.
The trajectory is the path of a moving