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

### 2. Answer the following questions:

### a. 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?

### b. What are (I) free fall, (II) acceleration due to gravity (III) escape velocity (IV) centripetal force?

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

### d. 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.

e. If the value of g suddenly becomes twice its value, it will become two times more difficult to pull a heavy object along the floor. Why?