REST

1. RESTAND MOTION
• Motion isa combined property of an object
understudy and the observer.
• Everything in the world isat rest or in
motion.
• There isno meaning of rest and motion
without the viewer.

2. WHAT ISREST?
• A body is said to be at rest it if does not change its
position with respect to its surroundings.
• For example, The passengers sitting in a moving bus are
said to be at rest with respect to the driver of the same
bus, because their positions do not change with respect
to the driver.

3. WHAT ISMOTION?
• A body issaid to be in motion if it changes its position
with respect to its surroundings.
• For example, The passengers sitting in a moving bus are
said to be in motion with respect to an observer
standing outside the bus.

4. RELATIVE RESTAND MOTION
• Rest and motion are relative terms.
• For example, a passenger sitting in a moving bus
isat rest because he/she isnot changing his/her
position with respect to other passengersor
objects in the bus. But to an observer outside the
bus, the passengers and the objects inside the bus
are in motion.

5. TYPES OF MOTION
• Different objects move differently. Some objects
move in a straight line, some move in a curved
path and some move in other different way.
• There are three types of motion:
i. Translatory motion
ii. Rotatory motion
iii. Vibratory motion

6. TRANSLATORY MOTION
• Intranslational motion, a body moves along a straight
line. The line may be straight or curved.
• For example, a car moving in a straight line is in
translational motion and a train moving along a straight
line also has translational motion.

7. TYPES OF TRANSLATORY MOTION
• There are three types of translatory motion:
i. Linear motion
ii. Circular motion
iii. Random motion
•Linear motion: (if a body moves along a straight line)
Example: aeroplane flying in a straight line.
•Circular motion: (if a body moves in a circular path)
Example: motion of earth around the sun.
• Random motion: (the disordered or irregular motion of an object)
• Example: motion of smoke or dust particles in the air.

8. ROTATORY MOTION
• The spinning motion of a body about its axis is
called its rotatory motion.
• An axisisa line around which a body rotates.
• For example, the motion of a wheel about itsaxis
and that of a steering wheel are the examples of
rotatory motion.

9. VIBRATORY MOTION
• Vibratory motion isthe back and forth (to and fro)
motion of an object.
• For example, a swing set. It vibrates back and
forth as you swing it. Motion of the pendulum of a
clock is also the example of vibratory motion.

10. PRESENTATION BY:
HOORIA SHAHZAD