Free Fall

A ball is thrown vertically upwards with a velocity of $20 {\mathrm{ms}}^{-1}$. If g is $10 {\mathrm{ms}}^{-2}$, then calculate:
(i) height it reaches. (ii) time taken to return back.

Rohan dropped a ball from a height of $5 \mathrm{m}$ and then he ran downstairs really fast to see if he can catch the ball. If he takes one minute to reach the ground, will he be able to catch the ball?

What happens if a body falls towards the earth?

Two stones are thrown into air with speeds $20 \mathrm{m} {\mathrm{s}}^{-1}$, $40 \mathrm{m} {\mathrm{s}}^{-1}$ respectively. What are accelerations possessed by the objects?

Given an example for the motion of an object of zero speed and with non zero acceleration?

 
In the figure above, we see that the moon 'falls' around the earth rather than straight into it. If the magnitude of velocity were zero, how would it move?

If a ball is thrown up, the motion is in upward direction, whereas the force due to earth's gravity is in downward direction. What is the speed at its maximum height?

An apple falls from a tree. An insect in the apple finds that the earth is falling towards it with an acceleration $g$. Who exerts the force needed to accelerate the earth with this acceleration.

Two objects of different masses falling freely near the surface of moon would 

At which of the following places will be value of '$g$' be maximum and why?

'$g$' on earth = _____ (SI unit).

Gravitational force of earth is called _____.

When a body is thrown upwards, then time of ascend = time of _____.

On what factors does value of '$g$' depend?

(Choose from the following: Mass and radius of the body / Mass and radius of the Earth / Only mass of the Earth/ Only mass of the body)

Who experimentally confirmed Galileo's statement that feather falls slowly than coin due to air resistance?

How does '$g$' vary with change in altitude above the earth's surface?

In which direction does the acceleration due to gravity on a planet act?

What would be the final velocity of a body thrown upwards with a particular velocity?

Two objects of masses $m_1$ and $m_2$ having the same size are dropped simultaneously from heights $h_1$ and $h_2$ respectively.  Find out the ratio of time they would take in reaching the ground. Will this ratio remain the same if : both of them are hollow, size remaining the same in each case. Give reason.

Two objects of masses $m_1$ and $m_2$ having the same size are dropped simultaneously from heights $h_1$ and $h_2$ respectively.  Find out the ratio of time they would take in reaching the ground. Will this ratio remain the same if : one of the objects is hollow and other is solid.