give an example for the following statements.
statements -
1. for a moving particle distance can never decrease with time while displacement can
2. a situation in which speed of the particle is always zero but average speed is not zero
3. a condition where the average speed is negative or zero
4. when a body's average velocity is equal to its instantaneous velocity but the motion is not uniform
Answers
Answer:-
1. Example:-
Consider a body revolving around in a circular path with respect to time it covers distance but as it approaches the initial point its displacement becomes zero I.e. decreases with time .
2. Example:-
Consider the case when stone is thrown upwards.
At the highest point the velocity is zero.
At the highest point the velocity is zero.But average velocity of total journey is not Zero.
At the highest point the velocity is zero.But average velocity of total journey is not Zero.
3. Example:-
Speed is related to distance and distance cannot be negative but it can be zero.
So,average speed can be zero when the body is stationary I.e. doesn't changes its position w.r.t time.
4. Example:-
Body's average velocity is equal to its instantaneous velocity when object is moving linearly and under uniform motion.
So, there is no example that body's average velocity equals the instantaneous velocity in non - uniform motion