Page 130 - Science Class 06

v Periodic Mo on : Mo on of a body v Uniform Mo on : Mo on of a body that
which is repeated by itself at regular covers equal distances in equal interval
intervals is called periodic mo on. of me is called uniform mo on.

Example : Movement of the needle of a Example : If a train covers 60 km in one
sewing machine. hour and again covers 60 km in one

hour, the mo on of the train is called
uniform mo on.
v Non-Uniform Mo on : If a body covers

equal distance in unequal interval of
me or covers unequal distance in
equal interval of me, the mo on of
the body in called non-uniform mo on.

Example : If the train covers 60 km in 1
hour, again it covers 60 km 2 hours and
v Non-Periodic Mo on : Mo on of a again it covers 60 km in 1.5 hours, then
body which is repeated by itself, but the mo on of the train is referred to as
not at regular interval is called non- non-uniform mo on.
periodic mo on.

Example : Mo on of des in the sea.

1. What is translatory mo on? Give any
two examples.
2. What is the difference between
rec linear and curvilinear mo on?
3. Give any two examples of oscillatory
mo on.
4. What kind of mo on of the sea waves
show?

Measurement : Comparison of the quantity to be measured with a reference standard

Unit : Reference standard of measurement
SI units : Internationally acceptable units of measurement
Light year : A unit of distance used to measure the distance between two heavenly
bodies

Motion : Continuous change of position of a body with respect to another body
Rest : No change of position with respect to other body
Rectilinear motion : Motion along a straight line

Curvilinear motion : Motion along a curved line

130 Science-6