a.Calculate the mass of a man on moon whose mass on the Earth is 60 Kg.

b.What will be his weight on the Earth ? Will his weight differ on the moon ? If so why ?

Imagine that a pipe is fixed through centre of the Earth (B) from the north pole (A) to the south pole (C).

IMage

1. If a ball rolls from A to B, what change will happen in the force of gravity experienced by the ball ?

2. What will be the weight of the ball at B ?

3. How will the weight of the ball change when it rolls from B to C ?

At which place on the surface of Earth does an object experiences the maximum force of gravity ? Give reason.

Two objects of mass 35 Kg and 45 Kg are placed 2 m apart. Find out the force of attraction between them.

Give reason -

Even though there is a force of attraction between two adjacent objects, they do not come closer attracting each other.

Consider two stones of mass 5 Kg and 50 Kg placed somewhere 500 m above the Earth’s surface.

1. Which stone will experience more force of attraction by the Earth ? Why?

2. If both the stones are allowed to fall freely at the same time, which one will reach the Earth’s surface first ? Give reason.

3. Compare the weight of the stones while falling down.

What do you mean by Gravitational force of attraction ? On what factors does the force of gravity depend ?