Free Kinetic Energy MCQs with Answers
57 Kinetic Energy MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Kinetic energy is the energy of motion, given for a nonrelativistic object by K = ½mv², so it depends on mass and the square of speed. Questions connect kinetic energy with work through the work energy theorem, calculate changes in kinetic energy, and distinguish it from momentum and potential energy.
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- A. 200 %
- B. 300 %
- C. 400 %
- D. 800 %
Explanation: Momentum P = mv Kinetic energy K.E= 1 /2 mv^2 K.E= p^2/ 2mIf p is increased vy 200% ,then new p will be.
Correct answer: 800 %- A. 100 J
- B. 1000 J
- C. 10 J
- D. none of these
Explanation: Kinetic energy = ½ mv^2 Mass = 5x10^-5 Velocity = 200 K.E = ½ (5x10^-5) (200^2) K.E = ½ (0.00005) (40000) K.E= 2/2 K.E= 1 Since the answer…
Correct answer: none of these- A. 1 J
- B. 3 J
- C. 30 J
- D. 2 J
Explanation: Work done to stop the disc = change in total kinetic energy of disc Final KE = 0 Initial KE = Translational K.E + Rotational K.EInitial…
Correct answer: 3 J- A. 1J
- B. 2J
- C. 3J
- D. 4J
Explanation: The Kinetic Energy is related to Momentum as;K.E. = P²/2mBy substituting values of 'P' and 'm' into the equation, we get;K.E.
Correct answer: 1J- A. 0.44
- B. 0.55
- C. 0.66
- D. 0.77
Explanation: If momentum is increased by 20%, then the kinetic energy increases by 44% or 0.44 The kinetic energy of an object is given by the equation…
Correct answer: 0.44- A. increases 4 times
- B. increases 6 times
- C. increases 8 times
- D. increases 10 times
Explanation: The kinetic energy of an object is given by the formula: KE = ½ mv²If both mass (m) and speed (v) are doubled, the new kinetic energy…
Correct answer: increases 8 times- A. 30J
- B. 55J
- C. 50J
- D. 22.5J
Explanation: Correct Option:DThis option is correct because we know from the formula of kinetic energyK.E=1/2mv²...(1)From the formula of momentum, we…
Correct answer: 22.5J- A. 200%
- B. 300%
- C. 400%
- D. 800%
Explanation: Kinetic Energy can also be expressed as p2/2m. Hence, KE is directly proportional to the square of momentum.
Correct answer: 800%- A. 0.44
- B. 0.55
- C. 0.66
- D. 0.77
Explanation: The increase in momentum is given as 20%, which can be expressed as a factor of 1.2.
Correct answer: 0.44- A. 11.4 m/s.
- B. 19.6 m/s.
- C. 22.8 m/s.
- D. 9.8 m/s.
Explanation: The problem involves applying the conservation of energy principle. Initially, the disc is at rest at the top of the hill, possessing only…
Correct answer: 19.6 m/s.- A. (P2 t2)/m
- B. (P2 t2)/2m
- C. (P2 t2)/3m
- D. (P2 t2)/4m
Explanation: The kinetic energy of a particle is given by the formula: KE = ½ mv² In this case, the particle is initially at rest, so its initial…
Correct answer: (P2 t2)/2m- A. m1:m2
- B. √m1/m2
- C. m1²: m2²
- D. √m1:√m2
Explanation: The energy and momentum are related The KE is proportional to square of momentum KE = p²/2m so if two bodies have equal energy then their…
Correct answer: √m1/m2- A. 12
- B. 144
- C. 72
- D. 48
Explanation: To determine the kinetic energy of the mass after 4 seconds, apply Newton's second law.
Correct answer: 144- A. 44%
- B. 36%
- C. 28%
- D. 20%
Explanation: Momentum p = mvIf momentum is decreased by 20%, the resulting new value is 80% of the original p-p'P - 0.2p = mv - m0.2vP - 0.2p = (m) (v)…
Correct answer: 36%- A. 4800 J
- B. 3500 J
- C. 1200 J
- D. 120 J
Explanation: To find the kinetic energy of the block when it has fallen 60m, we need to calculate the change in potential energy as it falls.
Correct answer: 1200 J- A. Weighs more than P
- B. Is moving faster than P
- C. Weighs the same as P
- D. Is moving slower than P
Explanation: To determine which object has more kinetic energy when two objects have the same momentum, examine their speeds.
Correct answer: Is moving faster than P- A. His height above the ground
- B. His mass
- C. Elevator's speed
- D. Elevator's direction of movement
Explanation: The primary factor that determines the man's kinetic energy is the elevator's speed.
Correct answer: Elevator's speed