Study the entries in the following table and rewrite them putting the connected items in a single row.

Answer the following question.

What is the difference between mass and weight of an object. Will the mass and weight of an object on the earth be same as their values on Mars? Why?

Answer the following question.

What are (i) free fall, (ii) acceleration due to gravity (iii) escape velocity (iv) centripetal force?

Answer the following question.

Write the three laws given by Kepler. How did they help Newton to arrive at the inverse square law of gravity?

Answer the following question.

A stone thrown vertically upwards with initial velocity u reaches a height ‘h’ before coming down. Show that the time taken to go up is same as the time taken to come down.