Page 7 - 9-phy-2 Kinematics

The value of free fall acceleration g is ........... cm2

1. Why time of free fall is taken as t = T ?
4

___________________________________________________

2. A student drops two identical marbles from different heights on sandy
ground. Which marble would penetrate more?

__________________________________________________

3. The emergency food supplies fall with the parachute attached as
shown. What is the acceleration of the food supplies, when
i. They remain attached to the falling parachute.

___________________________________

ii. They are released (detached) from the parachute.

___________________________________ S

BRAIN TEASERS

1. Two stones of different masses m1 and m2 are dropped from the same
height. Which stone will hit the ground first and why?

2. The velocity of a freely falling steel ball is plotted against time. What would
be the shape of the velocity-time graph? Give reason.

3. A skydiver of weight 800 N jumps out of an aeroplane. After he has been
falling for sometime, he is travelling at a constant speed. How big is the
force of air resistance acting on him?

18