Free Force and Motion MCQs with Answers
1,416 Force and Motion MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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1,416 questions · page 5 of 71
- A. Power of ten
- B. Powers of two
- C. Reciprocal
- D. Decimal
Explanation: Scientific notation writes a number as a coefficient multiplied by a power of ten, such as 3.2 × 10^5.
Correct answer: Power of ten- A. at2/2
- B. Vt
- C. a2t/2
- D. at2
Explanation: For motion from rest with constant acceleration, initial velocity u = 0, so displacement s = ut + 1/2 at^2 = 0 + 1/2 at^2 = at^2/2 metres…
Correct answer: at2/2- A. 5m/s, 1m/s
- B. 3m/s, 3m/s
- C. 6m/s, 1m/s
- D. 4m/s, 2m/s
Explanation: When the bodies move toward each other, their relative speed is v1 + v2 = 6 m/s; moving in the same direction, it is v1 - v2 = 4 m/s.
Correct answer: 5m/s, 1m/s- A. speed changes
- B. acceleration changes
- C. direction of motion changes
- D. displacement from origin changes
Explanation: Uniform velocity means both speed and direction remain constant, so the body continues changing its position and its displacement from the…
Correct answer: displacement from origin changes- A. has zero acceleration
- B. has uniform acceleration
- C. has variable acceleration
- D. moves in a circle
Explanation: With zero acceleration, velocity remains constant, so the instantaneous velocity has the same value throughout the motion as the average…
Correct answer: has zero acceleration- A. force
- B. displacement
- C. distance
- D. acceleration
Explanation: The area under a velocity-time graph is velocity multiplied by time, which gives displacement: displacement = ∫v dt.
Correct answer: displacement- A. 10m/s
- B. 36m/s
- C. zero
- D. infinite
Explanation: The man and the car are moving together with the same velocity, so their relative velocity is v_man/car = v_man - v_car = 0 m/s.
Correct answer: zero- A. its velocity
- B. its acceleration
- C. its position vector
- D. its momentum
Explanation: Motion means a body changes its position with time, so its position vector changes.
Correct answer: its position vector- A. 2.5
- B. 2.0
- C. 1.75
- D. 1.5
- E. 1.25
Explanation: Because the automobiles move toward each other, their closing speed is 60 km/h + 40 km/h = 100 km/h.
Correct answer: 1.5- 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. Accelerated frame of reference
- B. Inertial frame of reference
- C. Non-inertial frame of reference
- D. None
Explanation: Newton's first law holds in an inertial frame, where a body with no net force remains at rest or moves with constant velocity.
Correct answer: Inertial frame of reference- A. 12N, 5N, 20N
- B. 4N ,2N, 10N
- C. 10N, 18N
- D. 12N, 5N, 15N
Explanation: For three forces to produce equilibrium, their magnitudes must be able to form a closed triangle, so the largest force must not exceed the…
Correct answer: 12N, 5N, 15N- A. Moving body
- B. Body is at rest
- C. Both have not any inertia
- D. Both have same inertia because inertia depends upon mass only
Explanation: Inertia is the resistance of a body to a change in its state of motion, and it depends on mass rather than whether the body is moving or…
Correct answer: Both have same inertia because inertia depends upon mass only- A. Velocity
- B. Direction
- C. Mass
- D. Time
Explanation: Inertia depends only on mass: a greater mass requires a greater force to produce the same change in motion.
Correct answer: Mass- A. Energy
- B. Work
- C. Inertia
- D. Momentum
Explanation: Newton's first law states that an object remains at rest or in uniform straight-line motion unless an unbalanced external force acts on…
Correct answer: Inertia- A. Newton
- B. Pound
- C. Dyne
- D. None of these
Explanation: The CGS unit of force is the dyne, defined as 1 g cm/s². In SI units the corresponding unit is the newton (N), while the pound is used in…
Correct answer: Dyne- A. Newton
- B. Erg
- C. Dyne
- D. Joule
Explanation: In the CGS system, force is measured in dynes, where 1 dyne = 1 g·cm/s².
Correct answer: Dyne