Newtons third law of motion, law of conservation of linear momentum and applications - One Line Questions

1. If two objects of masses m1 and m2 are moving with velocities v1 and v2 respectively, and they collide and stick together (inelastic collision), the total momentum before collision is conserved and is equal to the momentum after collision, provided the system is isolated. The momentum after collision is: — (m1+m2)V, where V is the final velocity of the combined mass.
2. Newton's third law of motion states that for every action, there is an equal and opposite reaction. Which of the following scenarios best illustrates this law? — A rocket expelling gas downwards to propel itself upwards.
3. Consider two objects, A and B, interacting with each other. According to Newton's third law, the force exerted by A on B is: — Always equal in magnitude and opposite in direction to the force exerted by B on A.
4. If a system consists of only internal forces, its total linear momentum: — Remains constant.
5. During a collision between two objects, the net impulse on object 1 is equal and opposite to the net impulse on object 2. This is a consequence of: — Newton's third law.
6. Consider a collision between two particles. The impulse experienced by particle 1 is equal and opposite to the impulse experienced by particle 2. This is a direct consequence of: — Newton's third law.
7. Consider a collision between two billiard balls. If we consider the two balls as an isolated system, the total linear momentum *before* the collision is: — Equal to the total linear momentum *after* the collision.
8. In a collision between two objects, the forces they exert on each other are equal and opposite. This means the impulses they exert on each other are also: — Equal and in opposite directions.
9. Consider two masses, m1 and m2, connected by a string passing over a frictionless pulley (Atwood machine). If m1 > m2, both masses accelerate. The force exerted by the string on m1 is: — Equal to the tension in the string.
10. A child jumps from a moving train onto the platform. To land safely, the child should jump: — Forward with the train's velocity.
11. Consider a system of two particles interacting only with each other. If the initial momentum of the system is P, then the final momentum of the system after interaction will be: — Equal to P
12. A bomb explodes into several fragments. If we ignore air resistance, the total momentum of all fragments immediately after the explosion is: — Zero if the bomb was initially at rest.
13. During a collision between two bodies in an isolated system, the total momentum of the system immediately after the collision is: — Equal to the total momentum before the collision.
14. A gun recoils when a bullet is fired. If the gun were much heavier, its recoil velocity would be: — Lower than before.
15. If the net external force on a system is zero, then the velocity of the center of mass of the system: — Remains constant.
16. Which of the following quantities is conserved in an isolated system according to the law of conservation of linear momentum? — Linear momentum
17. In a perfectly elastic collision between two identical objects, the total momentum is conserved. What about kinetic energy? — Kinetic energy is conserved.
18. The impulse delivered to an object is equal to the change in its: — Linear momentum.
19. A system consists of two particles. If there are no external forces acting on the system, the center of mass of the system: — Must move with constant velocity.
20. A cannonball is fired from a cannon. If the mass of the cannon is M and the mass of the cannonball is m, and their velocities immediately after firing are V and v respectively, then by conservation of momentum: — MV = -mv
21. A cannon fires a cannonball. Immediately after firing, the cannon recoils backward. This recoil is a direct consequence of: — Newton's third law of motion.
22. A boat is floating on water. When a person jumps from the boat to the shore, the boat moves backward. This is an example of: — Newton's third law and conservation of linear momentum.
23. When walking, a person pushes backward on the ground. The ground, in turn, pushes forward on the person. This forward push is the force that allows the person to move. This is an application of: — Newton's third law.
24. A bird flies by pushing air downwards. This action results in an upward reaction force from the air on the bird, enabling flight. This is an example of: — Newton's third law.
25. A rocket works on the principle of: — Newton's third law and conservation of linear momentum.
26. The law of conservation of linear momentum is a direct consequence of: — Newton's third law.
27. A person is standing on a skateboard. When the person throws a ball horizontally, the skateboard moves backward. This is an application of: — Newton's third law and conservation of linear momentum.
28. When you jump off a cliff, you accelerate downwards due to gravity. The Earth also accelerates towards you, but its acceleration is negligible due to its immense mass. This illustrates: — Newton's third law.
29. An astronaut in space pushes a heavy object away from themselves. Both the astronaut and the object move in opposite directions. This is a demonstration of: — Newton's third law and conservation of linear momentum.
30. When a boat moves forward, the person on the boat pushes the water backward. This is an example of: — Newton's third law.
31. When a person stands on a boat and throws a stone forward, the boat moves backward. This is an example of: — Newton's third law and conservation of linear momentum.
32. A rocket expels gases at a high velocity. This expulsion is the action force. The reaction force is the thrust that propels the rocket forward. This is a clear application of: — Newton's third law.
33. When a person stands on a boat, the total momentum of the person-boat system is zero if they are initially at rest. If the person starts walking towards the bow, the boat will move towards the stern to conserve momentum. This demonstrates: — The law of conservation of linear momentum.
34. An isolated system is defined as a system where: — No external forces act on the system.
35. The law of conservation of linear momentum is applicable to: — Systems where the net external force is zero.
36. A particle of mass 'm' moving with velocity 'v' has a linear momentum 'p'. If its velocity doubles, its new momentum will be: — 2p
37. If a system is subjected to an external force, its total linear momentum will: — Change.
38. If a net force acts on a system, the total momentum of the system: — Changes at a rate equal to the net force.
39. Two skaters, A and B, are initially at rest on a frictionless surface. Skater A pushes skater B. According to Newton's third law, if the mass of A is greater than the mass of B, then: — The magnitude of acceleration of A is less than the magnitude of acceleration of B.
40. Which of the following statements is TRUE regarding the forces in Newton's third law? — The action and reaction forces act on different objects.
41. Consider a rifle firing a bullet. The recoil of the rifle is due to: — Newton's third law, where the rifle exerts a force on the bullet, and the bullet exerts an equal and opposite force on the rifle.
42. If the net external force on a system is zero, then: — The total momentum of the system is conserved.
43. The law of conservation of linear momentum states that: — The total momentum of an isolated system remains constant.
44. The rate of change of linear momentum of a system is equal to: — The net external force.
45. A spacecraft releases a probe. Both the spacecraft and the probe move away from each other. This is because: — The spacecraft exerts a force on the probe, and the probe exerts an equal and opposite force on the spacecraft.
46. A system of particles is said to be isolated if: — The sum of all external forces acting on the system is zero.
47. When you push a wall, the wall pushes back on you with an equal and opposite force. This prevents you from moving through the wall because: — The reaction force from the wall is equal and opposite to your push.
48. A fire hose sprays water. The hose tends to move backward as the water is expelled forward. This is because: — The force exerted by the hose on the water is met by an equal and opposite force exerted by the water on the hose.
49. A system is isolated if the vector sum of all external forces acting on it is zero. In such a system, the total linear momentum is: — Constant.
50. Two particles A and B collide. If the momentum of A changes by Δp, then the momentum of B changes by: — -Δp
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