Very Short Answer Type Questions 1. What name is given to the product of mass and velocity of a body? 2. Name the physical quantity which is considered to be a measure of the quantity of motion of a body 3. What is the SI unit of momentum ? 4. State whether momentum is scalar or vector. 5. What is the total momentum of the bullet and the gun before firing? 6. Name the physical quantity whose unit is kg.m/s. 7. What will be the momentum of a body of mass 'm' which is moving with a velocity 'V'? 8. What is the usual name of the forces which cannot produce motion in a body but only change its shape? 9. Name the unbalanced force which slows down a moving bicycle when we stop pedalling it. 10. State whether the following statement is true or false : Unbalanced forces acting on a body change its shape, 11. When a ball is dropped from a height, its speed increases gradually. Name the force which causes this change in speed. 12. Name the property of bodies (or objects) to resist a change in their state of rest or of motion. 13. What is the other name of Newton's first law of motion ? 14. The mass of object A is 6 kg whereas that of another object B is 34 kg. Which of the two objects, A or B, has more inertia ? 15. Name the scientist who gave the laws of motion 16. State whether force is a scalar or a vector quantity. 17. With which physical quantity should the speed of a running bull be multiplied so as to obtain its momentum ? 18. Fill in the following blanks with suitable words: (a) .................... is a measure of the inertia of a body. (b) When a running car stops suddenly, the passengers are jerked .......... (c) When a stationary car starts suddenly, the passengers are jerked (d) Newton's first law of motion is also called Galileo's law of ....... (e) If there were no unbalanced force of .............. and no .............. resistance, a moving bicycle would go on moving for ever.