Rest and motion ppt

This presentation is about rest and motion in which we study the three types of motion (Translatory motion, Rotatory motion and Vibratory motion) with their examples.

1. REST AND MOTION Motion is a combined property of an object under study and the observer. Everything in the world is at rest or in motion. There is no meaning of rest and motion without the viewer.

2. WHAT IS REST? A body is said to be at rest it if does not change its position with respect to its surroundings.  For example , T he 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 IS MOTION? A body is said 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 REST AND MOTION Rest and motion are relative terms. For example, a passenger sitting in a moving bus is at rest because he/she is not changing his/her position with respect to other passengers or 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: Translatory motion Rotatory motion Vibratory motion

6. TRANSLATORY MOTION In translational 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: Linear motion Circular motion 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 axis is a line around which a body rotates. For example, the motion of a wheel about its axis and that of a steering wheel are the examples of rotatory motion.

9. VIBRATORY MOTION Vibratory motion is the 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