Chapter 5
LAW OF MOTION
1. When we kick a stone ,we ge hurt due to which one of the following properties it happens
Ans:- reaction
2. Passengers standing in a bus thrown outward when the bus takes sudden turns.
This happens because of
Ans:- inertia
3. A body of mass 3kg moves with an acceleration of 2 m/s 2 . The change in momentum in one second is ...........
Ans:- force = change in momentum in one second 6 kg m/s
4. Unit of impulse is same as that
Ans:- impulse = change in momentum
5. Sliding friction is a self adjusting force . State whether this statement true or False
Ans:- False. Static friction is a self adjusting force
6. A bomb initially at rest explodes and the fragments move in different directions with different velocities. The total momentum of the fragments at any instance is
Ans:- conservation of momentum
7. A book is placed on the table. What is the angle between action of the book on the table and the reaction of the table on the book
Ans:- 180°
8. A body of mass 20 kg is sliding on a frictionless surface with velocity 1m/s .The force required to keep it moving with the same velocity 29 kg
Ans:- 0 N ( uniform velocity implies zero force)
9. A machine guns fires 120 bullet per minute . The mass of each bullet is
m and velocity is v.The force exerted on gun is
Ans :- 2 mv
10. If the radius of circular path particle is doubled without changing its angular velocity then the centripetal force on it is
Ans:- f is also doubled
11. What will be the force of friction suffered by a sphere rolling without slipping over a horizontal plane ?
Ans:- zero
12. A radioactive atom of mass 226 amu shoots out an alpha particle with a speed of 1.5 ×10 m/s . The speed of the radius atom is
Ans:- momentum of alpha particle + momentum of rasidual atom = 0
13. An aircraft executes a horizontal loop at a speed of 720 km /hour with its wings banked at 15°. What is the radius of the loop
Ans:- 15. 23 km
14. State the law of conservation of momentum
Ans:- it states that the total momentum of an isolated system of interacting particle is conserved
15. State the Newton's law
Ans:- The rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts
LAW OF MOTION
1. When we kick a stone ,we ge hurt due to which one of the following properties it happens
Ans:- reaction
2. Passengers standing in a bus thrown outward when the bus takes sudden turns.
This happens because of
Ans:- inertia
3. A body of mass 3kg moves with an acceleration of 2 m/s 2 . The change in momentum in one second is ...........
Ans:- force = change in momentum in one second 6 kg m/s
4. Unit of impulse is same as that
Ans:- impulse = change in momentum
5. Sliding friction is a self adjusting force . State whether this statement true or False
Ans:- False. Static friction is a self adjusting force
6. A bomb initially at rest explodes and the fragments move in different directions with different velocities. The total momentum of the fragments at any instance is
Ans:- conservation of momentum
7. A book is placed on the table. What is the angle between action of the book on the table and the reaction of the table on the book
Ans:- 180°
8. A body of mass 20 kg is sliding on a frictionless surface with velocity 1m/s .The force required to keep it moving with the same velocity 29 kg
Ans:- 0 N ( uniform velocity implies zero force)
9. A machine guns fires 120 bullet per minute . The mass of each bullet is
m and velocity is v.The force exerted on gun is
Ans :- 2 mv
10. If the radius of circular path particle is doubled without changing its angular velocity then the centripetal force on it is
Ans:- f is also doubled
11. What will be the force of friction suffered by a sphere rolling without slipping over a horizontal plane ?
Ans:- zero
12. A radioactive atom of mass 226 amu shoots out an alpha particle with a speed of 1.5 ×10 m/s . The speed of the radius atom is
Ans:- momentum of alpha particle + momentum of rasidual atom = 0
13. An aircraft executes a horizontal loop at a speed of 720 km /hour with its wings banked at 15°. What is the radius of the loop
Ans:- 15. 23 km
14. State the law of conservation of momentum
Ans:- it states that the total momentum of an isolated system of interacting particle is conserved
15. State the Newton's law
Ans:- The rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts
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