It is easier to revolve a stone by attaching it to a shorter string rather than- to a longer one. Why?

A bigger rain drop falls faster than smaller one. Why ?

It is easier to maintain the motion of a body than to start it. Why?

In PCl_5 the two axial bonds are longer than equitorial bonds why?

Why are we able to sip hot tea or milk faster from a saucer rather than a cup?

It is easier to catch, a table tennis ball than a cricket ball even when both are moving with same velocity. Why?

Why is it easier to start a car engine on a warm day than on a chilly day ?

A stone tied to one end of a string is rotated in a Circle. What happens when the stone is released?

A solid sphere rolls down two different inclined planes of the same heights but different angles of inclination, (a) Will it reach the bottom with the same speed in each case? (b) Will it take longer to roll down one plane than the other? (c) If so, which one and why?