Question

1. Give two examples of muscular force. 1
2. State any three effect of force. 3
3. Do liquids exert equal pressure in all direction? 1
4. Why our lungs expand during inhalation? 1
5. When a ball is thrown, it stops rolling after some time. Why? 2
6. Describe various types of force in brief. 4
7. Derive an activity to show that liquid exerting pressure on the wall of container. 4
8. Write true or false. 3a. Force of gravity is contact force.b. Pascal is the unit of force.c. The force can change the state of motion of an object.
9. Prove air has a pressure. 3
10. What do you meant by force of friction? Also prove force depends on nature of two surfaces in contact. 3

Answer 1

Answer:

1. squeezing lemon, pulling a cart.

2. change in speed, change in direction, change in size or shape

3. no

5.