Question

1. What is the state of an object which does not change its position with time?
2. What kind of motion is shown by the following:
a) earth moving about it's own axis.
b) earth moving around the sun.
3. Name the type of motion executed by the tyres of a moving car.
4. Name the types of motion a body undergoes during rolling.
5. Give an example of multiple motion.
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Answer 1

Answer:

1. Motion is when an object changes its position with respect to time but when time continues without the change in position of an object then it is said to be at rest.

2. Movement of earth on its own axis is called Rotation while movement around the Sun is called Revolution.

3. Linear motion: An object is said to have linear motion if it moves from one point to another in a straight line. For example: The motion of a moving car on a straight road.

4. Circular Motion is the type of motion executed by a rolling body.

5. The type of motion which is combination of two or more types of motion is called multiple motion. for example. a vehicle performs both rotatory and translatory motions. the wheels of a bicycle perform rotatory motion and the bicycle itself performs translatory motion

Explanation:

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Answer 2

Explanation:

1. Rest
2. a) Rotation and b) Revolution
3. Linear Motion
4. Rectilinear Motion
5. A vehicle performs both rotatory and translatory motions. the wheels of a bicycle perform rotatory motion and the bicycle itself performs translatory motion.

You are travelling by a train. Your wrist watch is also sharing the linear motion of the train. But the hands of the watch are also undergoing rotational motion.