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 21 of 71
- A. Range
- B. Trajectory
- C. Cycle
- D. Height
Explanation: The trajectory is the curve (typically parabolic under uniform gravity and no air resistance) that a projectile follows in space.
Correct answer: Trajectory- A. Horizontal 9.8 ms⁻²; vertical 9.8 ms⁻²
- B. Horizontal 0 ms⁻²; vertical 9.8 ms⁻²
- C. Horizontal 9.8 ms⁻²; vertical 0 ms⁻²
- D. Horizontal 0 ms⁻²; vertical 0 ms⁻²
Explanation: In projectile motion without air resistance horizontal acceleration is zero (no horizontal force) while vertical acceleration equals g…
Correct answer: Horizontal 0 ms⁻²; vertical 9.8 ms⁻²- A. 50km/hr
- B. 25km/hr
- C. 15km/hr
- D. 10km/hr
Explanation: Average speed = total distance / total time = 150 km / 3 hr = 50 km/h.
Correct answer: 50km/hr- A. It is non zero
- B. It is zero
- C. It is greater than zero
- D. It is less than zero
Explanation: If the car returns to its starting point after completing the circular trip, net displacement is zero, so average velocity…
Correct answer: It is zero- A. First increase and then decrease
- B. Increase
- C. Decrease
- D. Zero
Explanation: With no horizontal forces (neglecting air resistance), horizontal acceleration is zero; the horizontal component of velocity remains…
Correct answer: Zero406. A fighter plane drops a bomb when it is at the top of enemies target. Bomb misses the target due to:
- A. Horizontal component of velocity
- B. Action of gravity
- C. Vertical component of velocity
- D. Bad weather
Explanation: The bomb retains the plane's horizontal velocity upon release, so it travels horizontally while falling and thus misses the vertical…
Correct answer: Horizontal component of velocity- A. The force that the ball exerts on the ground is always equal to the weight of the ball
- B. The force that the ball exerts on the ground is always equal in magnitude and opposite in direction to the force the ground exerts on the ball
- C. The force that the ball exerts on the ground is always greater than the weight of the ball
- D. Both A and C
Explanation: When the ball hits the ground, it exerts a force on the ground, and by Newton's third law, the ground exerts an equal and opposite force…
Correct answer: The force that the ball exerts on the ground is always equal in magnitude and opposite in direction to the force the ground exerts on the ball- A. Much greater than the force experienced by the car
- B. Much lesser than the force experienced by the car
- C. Same as the force experienced by the car
- D. 10 times less than the force experienced by the car
Explanation: The force experienced by the housefly and the car must be equal in magnitude due to Newton's Third Law, which states that every action has…
Correct answer: Same as the force experienced by the car- A. 0°
- B. π/2 rad
- C. π rad
- D. 2π rad
Explanation: By Newton's third law action and reaction forces are equal in magnitude and opposite in direction; the angle between them is 180°, i.e.
Correct answer: π rad- A. 10 m/sec
- B. 0 m/sec
- C. 8 m/sec
- D. 12 m/sec
Explanation: Conservation of momentum: initial total = 1×8 + 4×6 = 8 + 24 = 32 kg·m/s.
Correct answer: 8 m/sec- A. 3, 1.25
- B. 3.75, 1.25
- C. 4.25, 1.25
- D. 3, 1
Explanation: Total distance = 100 + 50 = 150 m; total time = 40 s ⇒ average speed = 150/40 = 3.75 m/s.
Correct answer: 3.75, 1.25412. At which point for a projectile its kinetic energy is completely converted into potential energy?
- A. At point of projection
- B. At the highest point
- C. Point to hit the ground
- D. Not possible
Explanation: For a projectile with nonzero horizontal velocity, total kinetic energy never becomes zero because horizontal K.E persists.
Correct answer: Not possible413. An aircraft is moving with a velocity of 300ms⁻¹. If all the forces acting on it are balanced, then:
- A. It still moves with the same velocity
- B. It will explode
- C. It will lose its velocity gradually
- D. It will fall down instantaneously
Explanation: When net force is zero, Newton's first law states an object moves with constant velocity.
Correct answer: It still moves with the same velocity- A. 30°
- B. 60°
- C. 15°
- D. 45°
Explanation: Range R ∝ sin(2θ). Setting sin(2θ) = 1/2 (half of maximum where sin(2θ)=1) gives 2θ = 30° ⇒ θ = 15°.
Correct answer: 15°- A. 10ms⁻¹
- B. 15ms⁻¹
- C. 29.4ms⁻¹
- D. 12.2ms⁻¹
Explanation: Vertical velocity at top is zero: 0 = u − g t ⇒ u = g t = 9.8 × 3 = 29.4 m/s. This is the initial upward speed required.
Correct answer: 29.4ms⁻¹- A. 1:2
- B. 1:3
- C. 1:4
- D. 1:√2
Explanation: Maximum height ∝ sin²θ for given speed. So h30/h60 = sin²30 / sin²60 = (1/2)² / (√3/2)² = (1/4)/(3/4) = 1/3.
Correct answer: 1:3- A. 7.0 m/s²
- B. 5.0 m/s²
- C. 0.71 m/s²
- D. 35.0 m/s²
Explanation: From F = ma ⇒ a = F/m = 5.0 / 7.0 ≈ 0.714 m/s², rounded to 0.71 m/s².
Correct answer: 0.71 m/s²- A. 1 sec
- B. 3 sec
- C. 2 sec
- D. 4 sec
Explanation: Vertical component = v sin300 = 19.6 × 0.5 = 9.8 m/s. Time to top t = (vy)/g = 9.8/9.8 = 1s.
Correct answer: 1 sec- A. 20 m/s
- B. 6.67 m/s
- C. 60 m/s
- D. 29.4 m/s
Explanation: With no horizontal acceleration (neglecting air resistance), horizontal velocity remains constant at 20 m/s irrespective of time elapsed.
Correct answer: 20 m/s- A. Downward during both ascent and descent
- B. Downward during ascent and upward during descent
- C. Upward during ascent and downward during descent
- D. Upward during both ascent and descent
Explanation: Gravity provides a constant downward acceleration (g) at all times during free fall, whether the ball is moving upward, instantaneously at…
Correct answer: Downward during both ascent and descent