Page 1 CHAPTER - 13 MOTION AND TIME Page 2 CHAPTER - 13 MOTION AND TIME 1) Motion :- Motion :- is the change in position of an object with time. There are different types of motions. They are :- i) Motion along a straight line (Rectilinear motion) Eg :- Motion of a car on a straight road. ii) Periodic motion. Eg :- Motion of a pendulum. iii) Circular motion. Eg :- Motion of the earth around the sun. Motion along a straight line Periodic motion Circular motion Page 3 CHAPTER - 13 MOTION AND TIME 1) Motion :- Motion :- is the change in position of an object with time. There are different types of motions. They are :- i) Motion along a straight line (Rectilinear motion) Eg :- Motion of a car on a straight road. ii) Periodic motion. Eg :- Motion of a pendulum. iii) Circular motion. Eg :- Motion of the earth around the sun. Motion along a straight line Periodic motion Circular motion 2) Speed :- Speed :- The distance covered by an object in a unit time is called the speed of the object. Eg :- If a car covers a distance of 100 kilometres in one hour and a bus covers a distance of 50 kilometres in one hour, then the speed of the car is more than the speed of the bus. Since the speed of most objects are not constant, the speed is the average speed. Total distance covered Speed = -------------------------------- Time taken Uniform motion :- If the speed of an object is constant, it is in uniform motion. Non uniform motion :- If the speed of an object keeps changing, it is in non uniform motion. Page 4 CHAPTER - 13 MOTION AND TIME 1) Motion :- Motion :- is the change in position of an object with time. There are different types of motions. They are :- i) Motion along a straight line (Rectilinear motion) Eg :- Motion of a car on a straight road. ii) Periodic motion. Eg :- Motion of a pendulum. iii) Circular motion. Eg :- Motion of the earth around the sun. Motion along a straight line Periodic motion Circular motion 2) Speed :- Speed :- The distance covered by an object in a unit time is called the speed of the object. Eg :- If a car covers a distance of 100 kilometres in one hour and a bus covers a distance of 50 kilometres in one hour, then the speed of the car is more than the speed of the bus. Since the speed of most objects are not constant, the speed is the average speed. Total distance covered Speed = -------------------------------- Time taken Uniform motion :- If the speed of an object is constant, it is in uniform motion. Non uniform motion :- If the speed of an object keeps changing, it is in non uniform motion. 3) Measurement of time :- Time is measured by using clocks or watches. Clocks and watches make use of periodic motion. Wall clocks Table clock Watches Digital clocks Page 5 CHAPTER - 13 MOTION AND TIME 1) Motion :- Motion :- is the change in position of an object with time. There are different types of motions. They are :- i) Motion along a straight line (Rectilinear motion) Eg :- Motion of a car on a straight road. ii) Periodic motion. Eg :- Motion of a pendulum. iii) Circular motion. Eg :- Motion of the earth around the sun. Motion along a straight line Periodic motion Circular motion 2) Speed :- Speed :- The distance covered by an object in a unit time is called the speed of the object. Eg :- If a car covers a distance of 100 kilometres in one hour and a bus covers a distance of 50 kilometres in one hour, then the speed of the car is more than the speed of the bus. Since the speed of most objects are not constant, the speed is the average speed. Total distance covered Speed = -------------------------------- Time taken Uniform motion :- If the speed of an object is constant, it is in uniform motion. Non uniform motion :- If the speed of an object keeps changing, it is in non uniform motion. 3) Measurement of time :- Time is measured by using clocks or watches. Clocks and watches make use of periodic motion. Wall clocks Table clock Watches Digital clocks 4) Simple pendulum :- A simple pendulum has a small metallic bob suspended from a stand by a thread. If the bob is taken to one side and released, it moves to and fro. The to and fro motion of the simple pendulum is called periodic motion or oscillatory motion. A O B A simple pendulum Thread BobRead More

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