Which of the following statement is/are true ? 1. If a body changes its position with time it is said to be moving 2. Nothing is in absolute rest or in absolute motion

Which of the following statement is/are true ? 1. If a body changes its position with time it is said to be moving 2. Nothing is in absolute rest or in absolute motion Correct Answer Both 1 and 2

Concept:

Rest and Motion

• Rest: An object is said to be at rest if the position of the body remains the same with respect to a reference point. 
• Motion: An object is said to be in motion if the position is changing with time with reference to a point. 

Explanation:

• The concept of rest and motion can be explained by an example. 
• Consider Ram is moving in a train, he is in motion with respect to a person standing outside train. As the train moves, his position is changing with respect to the man outside. 
• Here the point of reference is the man sitting outside. 
• Consider, a man sitting next to him on the train. 
• Ram is at rest with respect to him because their relative position is not changing. 
• Both are moving together at the same speed on the train. 
• If the speed and direction of two objects are same they are in rest with respect to each other as their relative position remains the same. 

Conclusion:

Statement 1: If a body changes its position with time it is said to be moving. This is true. 

Statement 2: Nothing is in absolute rest or in absolute motion. This is true as anything in rest from one point of reference can be in motion if the reference point is changed. 

So, both statements are true.