extra qustions of force and preture
class 8th
Answers
Answer:
1. what is the unit of the pressure?
A: Newton.
2. Give one example where force moves a stationary object?
A: Pushing a chair.
3. Give one example where force stops a moving object?
A: A fielder stopping a ball.
4. What is force?
A: A push or a pull on an object is called a force.
5. Does liquid exert pressure in all directions?
A: Yes, liquid exert pressure in all directions.
6. Why does the shape of the tooth paste tube change when we squeeze it?
A: The shape changes because our finger applies force on the tube.
7. What can bring a change in state of motion of an object?
A: A force may bring a change in the state of motion of an object.
8. Which force can be used to gather iron pins scattered on the floor?
A: Magnetic force can be used to gather iron pins scattered on the floor.
9. Which force do the animals apply while moving ,chewing and doing other activities?
A: Muscular force.
10. Which force is responsible for raising our body hair when we try to take off a terylene or polyester shirt in the dry weather?
A: Electrostatic force.
11. Write one example where force changes the speed of a moving object?
A: Speed of moving a rubber tyre or a ring increases whenever it is pushed.
12. Why does a boat come to rest when we step rowing it?
A: Friction between water and the boat brings it to stop once we stop rowing.
13. Write any two application of atmospheric pressure in our everyday life?
A: Drinking straw and dropper work on the existence of atmospheric pressure.
14. What is pressure?
A: The force acting on an unit area of a surface is called pressure.
Pressure= force/ area on which it acts.
15. Give one practical application of Magnetic force?
A:The closing of door of refrigerator works on the application of Magnetic forces.
16. Give one example from daily life where force changes the shape of an object?
A: Example: The shape of dough changes on pressing with a rolling pin to make chapatis.
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