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 20 of 71
- A. The person moves forward
- B. The person remains stationary
- C. The person is unaffected
- D. The person moves backward
Explanation: Due to inertia the upper body tends to remain at rest while the feet accelerate with the bus, making the person appear to move backward…
Correct answer: The person moves backward- A. Inelastic collision
- B. Elastic collision
- C. Super elastic collision
- D. Perfectly inelastic collision
Explanation: In a perfectly inelastic collision bodies stick together after impact, maximizing kinetic energy loss while conserving momentum.
Correct answer: Perfectly inelastic collision- A. 5 ms⁻²
- B. 10 ms⁻²
- C. 9 ms⁻²
- D. 0 ms⁻²
Explanation: Constant velocity implies no change in speed or direction, so acceleration (the rate of change of velocity) is zero.
Correct answer: 0 ms⁻²- A. Increase in velocity per unit time
- B. Decrease in velocity per unit time
- C. Decrease in speed per unit time
- D. Increase in speed per unit time
Explanation: Retardation (deceleration) refers to a negative acceleration, i.e. a decrease in velocity per unit time.
Correct answer: Decrease in velocity per unit time- A. Velocity only
- B. Acceleration, velocity and displacement
- C. Displacement and velocity
- D. Displacement and acceleration
Explanation: During fall and rebound the ball's velocity and displacement change sign (direction).
Correct answer: Displacement and velocity- A. Hyperbola
- B. Area of a circle
- C. Parabola
- D. Straight line
Explanation: When the distance traveled equals the magnitude of displacement, the path must be the straight line between initial and final points; any…
Correct answer: Straight line- A. Acceleration
- B. Velocity
- C. Speed
- D. Displacement
Explanation: Displacement is the vector connecting initial and final positions and equals the shortest distance between two points, including direction.
Correct answer: Displacement- A. 10 m/s
- B. Zero
- C. 36 m/s
- D. Infinite
Explanation: Speed relative to the car for a person sitting stationary inside is zero because there is no relative motion between him and the car.
Correct answer: Zero- A. Elliptical path
- B. Parabolic path
- C. Circular path
- D. Rectilinear path
Explanation: Constant velocity requires both constant speed and constant direction; only rectilinear (straight-line) motion with unchanging speed…
Correct answer: Rectilinear path- A. 2 km per hour
- B. 0
- C. 1/2 km per hour
- D. 1/2 km per second
Explanation: Average velocity is total displacement over total time; since he returns to the starting point the net displacement is zero, so average…
Correct answer: 0391. If the shape of a velocity-time graph gradually decreases, then the body is said to be moving with:
- A. Positive acceleration
- B. Negative acceleration
- C. Uniform velocity
- D. None of these
Explanation: A decreasing v-t graph means velocity is reducing with time, which corresponds to negative acceleration (retardation); the slope of v-t…
Correct answer: Negative acceleration- A. 1st law
- B. 2nd law
- C. 3rd law
- D. All of these
Explanation: Newton's second law provides the quantitative definition of force: F = ma, linking net force to the rate of change of momentum (or…
Correct answer: 2nd law- A. A force is equal to the rate of change of momentum of the body upon which it acts.
- B. In a perfectly elastic collision, the relative momentum of the bodies before impact is equal to their relative momentum after impact
- C. The momentum of a body is the product of the mass of the body and its velocity
- D. The total momentum of a system of interacting bodies remains constant, providing no external force acts
Explanation: Conservation of momentum states that for an isolated system (no external force), the vector sum of momenta remains constant before and…
Correct answer: The total momentum of a system of interacting bodies remains constant, providing no external force acts394. The average force necessary to stop a hammer with 25N·s momentum in 0.05 s expressed in 'N' is:
- A. 500
- B. 125
- C. 50
- D. 25
Explanation: Average force = change in momentum / time = 25 N·s ÷ 0.05 s = 500 N. This is directly the impulse relation Favg Δt = Δp.
Correct answer: 500- A. A particle moving in a circular path
- B. The momentum of the particle remains constant
- C. A particle moving along a straight line with constant speed
- D. Constant acceleration of the particle
Explanation: If momentum is constant then no net external force is required (Δp/Δt = 0).
Correct answer: The momentum of the particle remains constant- A. Conservation of energy
- B. Conservation of momentum
- C. Backward thrust of gases produced
- D. Newton's first law of motion
Explanation: Recoil arises from conservation of momentum: when the bullet gains forward momentum, the gun acquires equal and opposite momentum backward…
Correct answer: Conservation of momentum- A. 0.3N
- B. 3N
- C. 300N
- D. 30N
Explanation: Force = Δp/Δt = (m v)/Δt = (0.15 kg × 20 m/s) / 0.1 s = 30 N. This assumes the ball is brought to rest in the given time.
Correct answer: 30N- A. Solid and soft
- B. Solid and hard
- C. Hard and elastic
- D. Soft and elastic
Explanation: Elastic collisions ideally occur between hard bodies that do not deform appreciably, minimizing energy loss to deformation and heat; hence…
Correct answer: Solid and hard- A. Potential energy
- B. Kinetic energy
- C. Momentum
- D. Both potential and kinetic energy
Explanation: In an explosion internal forces redistribute momenta but if no external force acts the total linear momentum of the system is conserved.
Correct answer: Momentum- A. Acceleration
- B. Velocity
- C. Vertical velocity
- D. Horizontal velocity
Explanation: At the apex the vertical component of velocity is zero because upward motion has ceased instantaneously; horizontal velocity remains…
Correct answer: Vertical velocity