Draw a velocity-time graph to represent the motion of a freely falling body towards the surface of the earth.

State the value of universal gravitational constant. What was its value back in 1947?

State true/false. If false, correct the statement: “Earth exerts a greater force of attraction on apple than apple exerts on the earth.”

Why moon does not have an atmosphere?

What is the gravitational force between earth and an object called?

(a) State Newton’s law of gravitation.
(b) Why is it called universal law?

Two electrons, each having mass 9.1 × 10^-31 kg, are separated by a distance 10 Å. Calculate the gravitational force between them.

A person weighs 600 N earth. Find his mass (g = 10 ms^-2).

If he weighs 100 N on the moon, what is the acceleration due to gravity on the moon?

Mathematically prove that acceleration due to the gravity of a body is independent of its mass.

Why is a gravitational force between you and your friend too weak to be experienced, but that between earth and sun is extremely large, through they are separated by large distance?

Distinguish between mass and weight of a body. When does a body experience weightlessness?

(a) A book has a mass 400 g. Find its weight when taken from the surface to a height equal to the radius of the earth.
(b) Define weight.

A car falls off a ledge and drops to the ground in 0.5 seconds.

Let g = 10 ms^-2, then

(a) What is its speed on striking the ground?

(b) What is its average speed during 0.5 second?

(c) how high is the ledge from the ground?

Define free fall.

State the equations of free fall.

Find the velocity with which a ball is thrown up if it reaches the maximum height in 5s. Also find its maximum height.

Raju goes to the vegetable vendor in the market. He notices that the needle of the balance is not in the centre of the balance. He takes the stuff, gets its mass checked in an electric balance and gets back to the vendor asking him to change the balance.

(a) How would you treat the vendor if you were in Raju’s place?

(b) Which values of Raju are noteworthy?

(c) Why is it important to check the weight of substance before buying it?