II. Answer the following questions in short:
1. When would we say that an object is in motion?
2. What do you understand by uniform motion and non-uniform motion? Give examples.
3 Define speed. What are different units of speed?
4 What is the drawback of a sundial clock?
5. Define average speed. How can you calculate average speed?
Answers
(1)An object is said to be in motion if it changes its position with respect to its immediate surroundings
(2) When a body moves along a straight line with uniform speed or steady speed is called Uniform motion. When a body moves along a straight line but with variable or change in speed is called non-uniform motion
(3)Speed is defined as. The rate of change of position of an object in any direction. It is measured as the ratio of distance to the time in which the distance was covered. Speed is a scalar quantity as it has only direction and no magnitude. Its unit is km/hr or m/sec
(4)The most major drawback of sundial is that it cannot be used in the night. Further it has to be kept outside and cannot be used inside the house or it cannot be wore on a wrist
(5)Average speed is calculated by dividing the total distance that something has traveled by the total amount of time it took it to travel that distance
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