How can we determine if an object is stationary or moving?

Explain frame of reference.

How can we determine whether an object is at rest or not?

Give some examples of motion.

When is an object said to be a particle?

On an open ground,a motorist follows a track that turns to his left by an angle of $60^{\circ}$ after every $500\; m$. Starting from a given turn,specify the displacement of the motorist at the third,sixth and eighth turn. Compare the magnitude of the displacement with the total path length covered by the motorist in each case.