Physics Questions PDF

## 5. Gravitation 1. What happens when the earth does not have gravitational force? 2. Write the real-life examples for 'centre of gravity'? 3. Whirl a stone which is tied to the end of the string continuously. The motion of the stone looks like: * Answer the following questions....

## 5. Gravitation 1. What happens when the earth does not have gravitational force? 2. Write the real-life examples for 'centre of gravity'? 3. Whirl a stone which is tied to the end of the string continuously. The motion of the stone looks like: * Answer the following questions. * What is the path of the stone? * How is the velocity and speed of the stone? * Write some daily life situations where you observe the uniform circular motion? 4. The mass of a body is 60 kg. Find the weight of the body (g=10 m/s²). 5. A ball is projected vertically up with a speed of 100m/s, what will be the maximum height attained, and the time to reach the maximum height (g=10 m/s²). 6. Vertically thrown up stone is falling down but not satellites. Hypothesise the reason. ## 7. The adjacent diagram shows the motion of an object moving in a circular path. Observe the diagram and answer the following questions: * Is the time of revolution constant? * Is the speed of the block constant? * What is the shape of its path? * Does the velocity of the body change in uniform circular motion? ## 8. When an apple falls from a tree, what happens to its gravitational potential energy just as it reaches the ground? After it strikes the ground? ## 9. What happens when an object is thrown upward? ## 10. If the rope walker is not holding a slight bending long pole while walking. What will happen? ## 11. A man is standing in a lift which is descending from 1st floor to the ground floor. What happens to his weight? Why? ## 12. Find the time taken by a body projected vertically with the speed of 20 m/s to return back to the ground?