Chapter-9. Force and Laws of Motion Science class 9 in english Medium CBSE Notes

Assignment: 

Q1. When a carpet is beaten with stick, dust particles come out of it. Expain the reason?

Q2. What is law of conservation of momentum?

Q3. Which of the following has more inertia:

(A) a bicycle or a train  

(B) a five rupee coin or a one rupee coin

Q4. Write S.I. unit of momentum.

Q5. State whether momentum is scalar or vector? 

Q6. What is called the product of mass and velocity of a body? 

Q7. Name the scientist who gave the laws of motion.

Q8. if a body have mass 'm' and velocity 'v' then what will be the momentum? 

Q9. On the basis of which law of motion rocket works? 

Q10. Which law of motion is called the law of inertia.

Q11. Which law of motion gives a method to measure the force?

Q12. Name the physical quantity which is multiply by velocity of an object to obtain momentum. 

Q13. Explain, why, it is easier to stop a tennis ball than a cricket ball moving with the same speed. 

Q14. Calculate the momentum of a toy car of mass 300 g moving with a speed of 5 m/s.

Q15. Write the S.I unit of force.