Gravitation

Which of the following is not the equation of motion for a freely falling body ?

When a spring balance holding a mass is allowed to fall freely, what reading will it show?

Why do all objects have a tendency to fall towards the earth?

Establish the relationship between $g$ and $G$.

Suppose a planet exists whose mass and radius both are double that of the earth. Calculate the acceleration due to gravity at its surface.

If a planet exists with a radius which is double that of earth and made of the same material of density $d$, find its acceleration due to gravity in terms of that on the surface of the earth.

If the force of the earth on the moon vanishes suddenly, what will be the path of the moon? Give reasons.

How much would a $70 \mathrm{kg}$ man weigh on the moon? What will be his mass on the earth? (take ${\mathrm{g}}_{\mathrm{m}}=1.6 \mathrm{m}/{\mathrm{s}}^2$)

An object weighs $588 \mathrm{N}$ on the earth. What would be its mass on the moon? What is the acceleration due to gravity on the moon? (take $\mathrm{g}=9.8 \mathrm{m}/{\mathrm{s}}^2$)

The weight of a body is $98 \mathrm{N}$. What is its mass?

What is the weight of a body whose mass is $20 \mathrm{kg}$? (take $\mathrm{g}=10 \mathrm{m}/{\mathrm{s}}^2$)

Show that the weight of an object on the moon is $\frac{1}{6}th$ of its weight on the earth.

Define the relationship: $W=m\times g$.

When is the acceleration due to gravity taken as

a. positive and 

b. negative?

What is the final velocity when a body is thrown vertically upwards?

Calculate the acceleration due to gravity when a spaceship is at a distance equal to twice the earth's radius from the centre of the earth.

A stone is tied at one end of a thread and made to whirl around by the hand.

What happens when the stone is released?

A stone is tied at one end of a thread and made to whirl around by the hand. What keeps the stone moving along the circular path?

The gravitational force is not responsible for the

The value of G is