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.
Last updated
1,416 questions · page 22 of 71
- A. The average velocity during the first second of time is 4.9m/s
- B. During each second the object falls 9.8m
- C. The acceleration changes by 9.8m/s² every second
- D. The object falls 9.8m during the first second of time
Explanation: From rest with constant acceleration g, average velocity in first second = (0 + g·1)/2 = g/2 = 9.8/2 = 4.9 m/s.
Correct answer: The average velocity during the first second of time is 4.9m/s- A. 39.2 ms⁻¹
- B. 49 ms⁻¹
- C. 19.6 ms⁻¹
- D. 94.9 ms⁻¹
Explanation: v = g t with initial v = 0: v = 9.8 × 5 = 49 m/s downward after 5 seconds.
Correct answer: 49 ms⁻¹- A. East
- B. Up
- C. West
- D. Zero
Explanation: Constant velocity implies zero net force (forces balance). Thus the net force acting on the car is zero.
Correct answer: Zero- A. The one fired at 20°
- B. The one fired at 70°
- C. Both have the same range
- D. None of these
Explanation: Angles that add to 90°(complementary) yield equal range for the same speed; 20°and 70° are complementary, so their ranges are equal.
Correct answer: Both have the same range- A. 1s
- B. 2s
- C. 3s
- D. 4s
Explanation: Let t be crossing time. Downward displacement from top = 1/2 g t², upward stone displacement = v t − 1/2 g t².
Correct answer: 1s- A. 5.0 m/s²
- B. 10 m/s²
- C. 15 m/s²
- D. 25 m/s²
Explanation: Net upward force = 7500 − 5000 = 2500 N. Using F = ma ⇒ a = 2500 / 500 = 5.0 m/s².
Correct answer: 5.0 m/s²- A. The maximum velocity of the feather is 9.8 m/s
- B. The acceleration of the feather remains constant during the fall
- C. The acceleration of the feather increases during the fall
- D. The acceleration of the feather decreases until terminal velocity is reached
Explanation: In vacuum there is no air resistance, so the feather falls with constant acceleration equal to g throughout the fall; terminal velocity…
Correct answer: The acceleration of the feather remains constant during the fall428. A force F = 8i -6j -10k newton produces acceleration of 1 ms-2 in a body. The mass of the body is:
- A. 10kg
- B. 10√2kg
- C. 10√3kg
- D. 200kg
Explanation: Magnitude of force |F| = √(8² + (−6)² + (−10)²) = √(64+36+100) = √200 = 10√2 N. With a = 1 m/s², mass m = |F|/a = 10√2 kg.
Correct answer: 10√2kg- A. 104 N
- B. 108 N
- C. 0 N
- D. 2 x 10^4 N
Explanation: In equilibrium the tension is equal to the pulling force applied by each team (assuming ideal massless rope), so tension = 104 N.
Correct answer: 104 N- A. 1 kgms-2
- B. 2 kgms-2
- C. 3 kgms-2
- D. 4 kgms-2
Explanation: Rate of change of momentum = F = m a = 1 kg × 1 m/s² = 1 N = 1 kg·m/s².
Correct answer: 1 kgms-2- A. 0 mg
- B. 2 mg
- C. 4 mg
- D. 5 mg
Explanation: The 5th coin supports the four coins above it, so the normal reaction equals weight of 4 coins = 4 m g, where m is mass of one coin.
Correct answer: 4 mg- A. Backward
- B. Forward
- C. Sideways
- D. None of these
Explanation: By Newton's third law, pushing the boat (or jumping forward) exerts a backward impulse on the boat, causing it to move backward while you…
Correct answer: Backward433. A force of 5 newton acts on a body of weight 9.80 newton. What is the acceleration produced in ms-2?
- A. 0.51
- B. 1.96
- C. 5.00
- D. 49.00
Explanation: Weight 9.80 N implies mass m = W/g = 9.8/9.8 = 1 kg. Then a = F/m = 5/1 = 5.0 m/s².
Correct answer: 5.00- A. The same object
- B. Different objects
- C. The surrounding environment
- D. Cannot be determined
Explanation: Newton's third law states that action and reaction forces are equal, opposite, and act on two different interacting bodies, not on the…
Correct answer: Different objects- A. Positive
- B. Negative
- C. Maximum
- D. Zero
Explanation: Uniform velocity means no change in speed or direction; hence acceleration, which measures change in velocity, is zero.
Correct answer: Zero- A. Zero
- B. 10 ms-1
- C. 20 ms-1
- D. 2 ms-1
Explanation: Velocity vectors at opposite points are equal in magnitude but opposite in direction; change Δv = v(final) − v(initial) = (−5) − (+5) =…
Correct answer: 10 ms-1- A. Time
- B. Displacement
- C. Velocity
- D. Acceleration
Explanation: The third equation vf² − vi² = 2aS relates velocities, acceleration and displacement but does not contain time, so it is independent of…
Correct answer: Time- A. Gram
- B. Kilogram
- C. Pound
- D. Newton
Explanation: Weight is a force (mass × gravity) and its SI unit is the newton (N); gram and kilogram are mass units, pound is not SI.
Correct answer: Newton- A. 15.8 m
- B. 19.6 m
- C. 25.6 m
- D. 30 m
Explanation: Initial velocity = 19.6 m/sEquation of motion = v = u - gtHeight h = ut - 1⁄2 gt2v = final velocity at max.
Correct answer: 19.6 m- A. Zero
- B. Accelerated
- C. Decelerated
- D. Maximum
Explanation: Neglecting air resistance, no horizontal force acts on a projectile so horizontal acceleration is zero and horizontal velocity remains…
Correct answer: Zero