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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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Displacement and VelocityAccelerationProjectile MotionNewton's Laws of MotionLinear MomentumCollisions
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1,416 questions · page 48 of 71

941. If it is projected at an angle of 35o, It hits certain target. It will have the same range if it is projected at an angle of:

  • A. 45o
  • B. 65o
  • C. 55o
  • D. 70o

Explanation: In projectile motion, the range R is given by the formula R = (Vi2 sin(2θ))/g, where Vi is the initial velocity, θ is the angle of…

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Correct answer: 55o

942. How large a force is required to accelerate a body of weight 5 N with 4 ms-2 (g 10 ms-2):

  • A. 10 N
  • B. 2 N
  • C. 5 N
  • D. 1 N

Explanation: To solve this problem, we start by determining the mass of the object using its weight.

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Correct answer: 2 N

943. A body having a uniform acceleration of 10 ms-2 has a velocity of 100 ms-1. In what time its velocity will be doubled:

  • A. 8 s
  • B. 12 s
  • C. 10 s
  • D. 14 s

Explanation: The initial velocity Vi is 100 ms-1 and the final velocity Vf is 200 ms-1 because the velocity is doubled.

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Correct answer: 10 s

944. Velocity of an object dropped from a building at any instant "t" is given by:

  • A. 1/2 gt2
  • B. vit +1/2 gt2
  • C. t2
  • D. gt

Explanation: The correct answer is gt. When an object is dropped from rest, its initial velocity (vi) is zero.

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Correct answer: gt

945. A ball is thrown up with 20 ms-1 at an angle of 60° with x-axis. The horizontal velocity of the ball at the top position is:

  • A. 0 ms-1
  • B. 20 ms-1
  • C. 10 ms-1
  • D. 16 ms-1

Explanation: In projectile motion, the horizontal component of velocity remains constant throughout the motion, as there is no horizontal acceleration…

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Correct answer: 10 ms-1

946. Which of the curves on the graph below best represents the vertical component "vy" of the velocity versus the time t for a projectile fired at an angle of 45o above the horizontal?

  • A. OC
  • B. AB
  • C. DE
  • D. AE

Explanation: During a projectile motion the vertical component of velocity, changes with time, and is zero at the maximum height.

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Correct answer: AE

947. A projectile is fired from ground with an initial velocity that has a vertical component of 20m/s and a horizontal component of 30m/s. Using g = 10m/s2, the distance from launching to landing points is:

  • A. 40m
  • B. 80m
  • C. 60m
  • D. 120m

Explanation: The projectile is launched with a vertical velocity of 20 m/s and a horizontal velocity of 30 m/s.

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Correct answer: 120m

948. A student's life was saved in an automobile accident because an airbag expanded in front of his head. If the car had not been equipped with an airbag, the windshield would have stopped the motion of his head in a much shorter time. Compared to the windshield, the airbag:

  • A. Causes a much smaller change in momentum
  • B. Exerts a much smaller impulse
  • C. Causes a much smaller change in kinetic energy
  • D. Exerts a much smaller force

Explanation: The correct answer is Option D: Exerts a much smaller force. When a collision occurs, the airbag extends the time it takes for the head to…

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Correct answer: Exerts a much smaller force

949. Which of the following velocity-time graph represents infinite acceleration?

  • A. Straight line normal to the time-axis
  • B. Straight line inclined to the time axis at an angle of 45°
  • C. Straight line parallel to the time axis
  • D. Straight line inclined to the time axis at an angle of 135o

Explanation: The correct answer is Option A: A straight line normal to the time-axis represents infinite acceleration.

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Correct answer: Straight line normal to the time-axis

950. A train of length 150 in is going to north with a speed of 10ms-1. A parrot flies 5 ms-1 toward south parallel to the railway line. The time taken by parrot to cross the train is:

  • A. 8 s
  • B. 10 s
  • C. 12 s
  • D. 15 s

Explanation: To find the time taken by the parrot to cross the train, consider their relative speeds.

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Correct answer: 10 s

951. A body covers one half of its journey at 40ms-1 and the next half at 50ms-1. Its average velocity is:

  • A. 44.4 ms-1
  • B. 45 ms-1
  • C. 50 ms-1
  • D. 40 ms-1

Explanation: To calculate the average velocity when a body travels equal distances at different speeds, use the harmonic mean formula for average…

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Correct answer: 44.4 ms-1

952. The rate of change of momentum for a freely falling object is always:

  • A. = mg
  • B. > mg
  • C. < mg
  • D. Zero

Explanation: The correct answer is that the rate of change of momentum for a freely falling object is always equal to its weight, mg.

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Correct answer: = mg

953. A car of mass 800 kg is being driven along a level road. The engine supplies a forward force of 3600 N and the total resistive force is 2000 N.What is the acceleration of the car?

  • A. 2.0 ms-2
  • B. 2.5 ms-2
  • C. 4.5 ms-2
  • D. 7.0 ms-2

Explanation: To find the acceleration of the car, we apply Newton's Second Law of Motion, which states that the acceleration is the net force acting on…

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Correct answer: 2.0 ms-2

954. A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion? (taking g = 10ms-2)

  • A. 15 m
  • B. 5 m
  • C. 20 m
  • D. 25 m

Explanation: To calculate the distance fallen during the interval between the 1st and 2nd seconds, we use the kinematic equation for uniformly…

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Correct answer: 15 m

955. If the speed of a particle at the end of four successive hours is 20, 25, 30, 35 km/hr, then the acceleration of the particle is:

  • A. 5 m/sec2
  • B. 5 m/hr2
  • C. 5 km/hr2
  • D. 5 km/sec2

Explanation: The acceleration of a particle is calculated using the formula a = (vfinal - vinitial) / t.

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Correct answer: 5 km/hr2

956. A bomb is dropped from an aeroplane moving horizontally with a speed of 200 mph (miles per hour). If the air resistance is negligible, the bomb will reach the ground in 5 sec when the altitude is (g = 10ms-2):

  • A. 4 miles
  • B. 40 m
  • C. 125 m
  • D. 10 m

Explanation: The bomb is released from an aeroplane moving horizontally, but its vertical motion is influenced solely by gravity.

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Correct answer: 125 m

957. A particle accelerates uniformly from 10 km/hr to 20 km/hr with acceleration of 2 km/hr2. The total time it takes is:

  • A. 20 hr
  • B. 10 min
  • C. 10 hr
  • D. 5 hr

Explanation: The formula for acceleration is a = ∆v/∆t, where ∆v is the change in velocity and ∆t is the change in time.

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Correct answer: 5 hr

958. Two bodies of unequal mass, placed at rest on a frictionless surface, are acted on by equal horizontal forces for equal times. Just after these forces are removed, the body of greater mass will have:

  • A. The smaller acceleration
  • B. The greater acceleration
  • C. The smaller momentum
  • D. The greater momentum

Explanation: According to Newton's Second Law of Motion, F = ma or a = F/m. When two bodies of unequal mass are subjected to equal forces, the…

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Correct answer: The smaller acceleration

959. A 0.2 kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30m/s and rebounds up at 20m/s. The impulse on the ball during the collision is:

  • A. 10 Ns upward
  • B. 2.0 Ns upward
  • C. 10 Ns downward
  • D. 2.0 Ns downward

Explanation: Pi = mvi = (0.2)( -30) = - 6 Ns Pr= mvr= (0.2)(20) = + 4 Ns △P = mvr- mvi = + 4 - (- 6) = + 10 Ns Taking downward velocity is -ve and…

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Correct answer: 10 Ns upward

960. A 10 kg block of ice is at rest on a frictionless horizontal surface. A 1.0 N force is applied in East direction for 1.0 s. During this time interval, the block:

  • A. acquires a speed of 1 m/s
  • B. acquires a momentum of 1.0 kg m/s
  • C. moves 10 cm
  • D. acquires a kinetic energy of 0.1 J

Explanation: The correct answer is that the block acquires a momentum of 1.0 kg m/s.

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Correct answer: acquires a momentum of 1.0 kg m/s
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