Free Linear Momentum MCQs with Answers
38 Linear Momentum MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Linear momentum is the vector product of mass and velocity, p = mv, and changes when a net external force acts. Work includes impulse as the change in momentum, conservation of momentum in isolated systems, collisions and explosions, and the distinction between elastic, inelastic and perfectly inelastic collisions.
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- A. N s-1
- B. kg m s-1
- C. kg m s-2
- D. N m
Explanation: Momentum is mass times velocity, so its unit is kilogram metre per second.
Correct answer: kg m s-1- A. the rate of change of momentum
- B. momentum multiplied by time
- C. mass divided by acceleration
- D. work divided by distance only
Explanation: F equals ma is the special case of this for constant mass; the momentum form is more general and handles situations such as a rocket…
Correct answer: the rate of change of momentum- A. its change in kinetic energy
- B. its change in momentum
- C. the work done on it
- D. its mass times its velocity
Explanation: Impulse is force multiplied by the time for which it acts, and it equals the change in momentum, which is why airbags and crumple zones…
Correct answer: its change in momentum- A. the exhaust gases push against the air behind it
- B. the momentum carried away by the exhaust gases is balanced by an equal forward momentum of the rocket
- C. gravity pulls it forward
- D. it becomes lighter as fuel burns
Explanation: Conservation of momentum, equivalently Newton's third law, means expelling mass backwards at speed drives the rocket forwards, and no…
Correct answer: the momentum carried away by the exhaust gases is balanced by an equal forward momentum of the rocket- A. 20 kg m per second
- B. 0.8 kg m per second
- C. 50 kg m per second
- D. 9 kg m per second
Explanation: Momentum is mass multiplied by velocity, so 4 multiplied by 5 gives 20 kg m per second in the direction of motion.
Correct answer: 20 kg m per second- A. Law of conservation of energy
- B. Backward thrust of the gases
- C. Newton's third law of motion
- D. Newton's first law of motion
Explanation: The cannon pushes the shell forward and the shell pushes the cannon back with an equal and opposite force, which is the third law, and the…
Correct answer: Newton's third law of motion- A. -1
- B. 1
- C. 2
- D. -2
Explanation: Rocket thrust is proportional to the exhaust gas velocity through F = (dm/dt)ve, and acceleration is F/m, so acceleration is proportional…
Correct answer: 1- A. provide him a larger inertia
- B. decreases his inertia
- C. decreases his momentum
- D. increases his momentum
Explanation: Running before take-off increases the athlete's speed while mass remains the same, so momentum p = mv increases.
Correct answer: increases his momentum- A. force acts on the body
- B. mass of the body
- C. velocity of the body
- D. both mass and velocity of the body
Explanation: Linear momentum is defined by p = mv, so it depends on both the mass m in kilograms and velocity v in metres per second, with momentum…
Correct answer: both mass and velocity of the body- A. 1st law of motion
- B. 2nd law of motion
- C. Law of conservation of momentum
- D. law of conservation of energy
Explanation: A rocket ejects hot gases backward, and the total momentum of the rocket-gas system remains conserved.
Correct answer: Law of conservation of momentum- A. 2000 m/s
- B. 2 m/s
- C. 20 m/s
- D. 200 m/s
- E. 100 m/s
Explanation: The principle of conservation of momentum states that the total momentum of an isolated system remains constant.
Correct answer: 2 m/s- A. Linear velocity
- B. Linear momentum
- C. Linear acceleration
- D. Inertia
Explanation: The rotational momentum and "linear momentum both form the same function in a body, they are responsible for keeping the body moving in…
Correct answer: Linear momentum- A. I only
- B. I and II only
- C. I and III only
- D. III only
- E. I, II and III
Explanation: If there is no external force applied to the system, then the total momentum of that system remains constant.
Correct answer: I only- A. mp2/r
- B. rm/p
- C. p2/rm
- D. pmr
Explanation: Option C is correct.The radial force is the centripetal force that keeps the particle moving in a circular path.
Correct answer: p2/rm- A. Momentum
- B. Force/Time
- C. velocity
- D. none
Explanation: Here is the explanation of the correct option
Correct answer: Momentum- A. 1:1
- B. 1:2
- C. 2:1
- D. 1:4
Explanation: Here is the explanation of the correct option
Correct answer: 1:1- A. Two times
- B. 3 times
- C. Four times
- D. Remains same
Explanation: As KE=1/2*mv2=p2/2mKE∝p2KE1=p12 eq1KE2=p2² eq2Dividing eq2 by eq 1,we getKE2/KE1=p2²/p1² eq3 taking p1as p and p2 as 2pput value in eq 3we…
Correct answer: Four times- A. 1 : 2
- B. 1 : 1
- C. 4 : 1
- D. 1 : 4
Explanation: Given:Kinetic energy ratio: KE_1 / KE_2 = 4/1Linear momentum: p_1 = p_2Relationship between kinetic energy (KE), momentum (p), and mass…
Correct answer: 1 : 4- A. Increases
- B. Decreases
- C. Becomes zero
- D. Remains the same.
Explanation: When a bullet is fired and passes through a bag of sand, the principle of conservation of momentum applies.
Correct answer: Decreases- A. Heat
- B. Mass
- C. Energy
- D. Momentum
Explanation: The correct answer is Momentum. Rocket propulsion is explained by Newton's third law of motion: for every action, there is an equal and…
Correct answer: MomentumLinear Momentum MCQs: common questions
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There are 38 Linear Momentum MCQs in the Physics bank, shown 20 to a page with the correct answer and an explanation on each.
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