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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 26 of 71

501. If we drop an object, it's initial velocity is zero. How far will it fall in time 't'?

  • A. 9.8 t^2
  • B. 4.9 t^2
  • C. 0.49 t^2
  • D. 98 t^2

Explanation: Use the kinematics, straight line motion formula : s= u +½ at^2 s= 0 + ½ x 9.8x t^2 s= 4.9t^2

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Correct answer: 4.9 t^2

502. The newton-second is the unit of:

  • A. Work
  • B. Power
  • C. Impulse
  • D. velocity

Explanation: Impulse is the change in momentum. The formula for change in momentum is Force into the interaction period which is basically a particular…

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Correct answer: Impulse

503. Which one of the following force is non-conservative:

  • A. Frictional force
  • B. Gravitational force
  • C. Electric force
  • D. Elastic spring force

Explanation: Frictional force is non conservative fields while elastic string force, electric, magnetic, and gravitational fields are constants.

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Correct answer: Frictional force

504. A car is travelling in a straight line along a highway at a constant speed of 80miles per hour for 10 seconds. Find its acceleration.

  • A. 100 m/s2
  • B. 200 m/s2
  • C. 0m/s2
  • D. 150m/s2
  • E. 220m/s2

Explanation: The car is traveling at a constant speed, which means there is no change in its velocity. Acceleration is the change in velocity.

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Correct answer: 0m/s2

505. If the velocity of the body is decreasing, the acceleration is negative. The negative acceleration is known as:

  • A. Retardation
  • B. Deceleration
  • C. Negative displacement
  • D. Negative motion
  • E. Both A and B

Explanation: The negative of acceleration or decrease in acceleration is also known as deceleration or retardation.Hence option A,B and are true.

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Correct answer: Both A and B

506. An object is dropped from the top of the building. If it takes 10 seconds to hit the ground, what is the height of the building?

  • A. 390 m
  • B. 490 m
  • C. 590 m
  • D. 690 m
  • E. 790 m

Explanation: As the object is dropped so initial velocity is zero :vi =0 m/st =10 sh = ?h = vixt +½ gt2 h = 0x10 +½ (9.8)(10)2 (g=9.8m/s2)h = 490 mSo…

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Correct answer: 490 m

507. Two spherical balls of 2.0 kg and 3.0 kg masses are moving towards each other with velocities of 6 m/s and 4 m/s respectively. What must be the velocity of the smaller ball after the collision, if the velocity of the bigger ball is 3 m/s?

  • A. 1.5 m/s
  • B. 2.5 m/s
  • C. 3.5 m/s
  • D. -4.5 m/s
  • E. 5.5 m/s

Explanation: Initial velocity of 2kg mass = 6m/s Initial velocity of 3kg mass = -4m/s [-ve sign shows opposite direction] Final velocity of 3kg mass =…

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Correct answer: -4.5 m/s

508. A 100 kg golf ball is moving to the right with a velocity of 20 m/s. It makes a head on collision with an 8 kg steel ball, initially at rest. The two balls get stuck together. What will the velocity of these two balls after collision?

  • A. 14.3 m/s
  • B. 17.5 m/s
  • C. 18.5 m/s
  • D. 19.7 m/s
  • E. 20.0 m/s

Explanation: Given: m1= 100 kg v1=20m/s m2=8kg v2= 0 Solution: After collision We know, Initial momentum=final momentum m1v1+m2v2= m1u1+m2u2…

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Correct answer: 18.5 m/s

509. An object with constant mass rests on a horizontal surface whose coefficient of friction is 0.2. If a horizontal force F is applied to the object, what will be the effect(s) on the object? I. It may move with constant speed in the direction of F once it has been set in motion. II. It may remain at rest. III. It may accelerate. IV. It may move with constant speed in an opposite direction

  • A. I, II and III only
  • B. I and III only
  • C. II and IV only
  • D. IV only
  • E. III only

Explanation: 1. It is possible that object starts to accelerate when the frictional force becomes greater enough due to objects motion to equalize the…

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Correct answer: I, II and III only

510. A person having a mass of 60 kilograms exerts a horizontal force of 200 Newtons in pushing a 90 kilogram object a distance of 6 meters along a horizontal floor. He does this at constant velocity in 3 seconds. The weight of this person approximately, in Newtons, is: (g=9.8m/s2)

  • A. 40 N
  • B. 90 N
  • C. 200 N
  • D. 400 N
  • E. 600 N

Explanation: Solution: As the weight is W=mg taking g= 10ms-2 According to the question mass of person is 60 kg hence the weight of person is 60x10…

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Correct answer: 600 N

511. A car is traveling with uniform acceleration along a straight road. The road has marker posts every 100 m. When the car passes one post, it has a speed of 10 m/s and when it passes the next one, its speed is 20 m/s. What is the car's acceleration?

  • A. 0.67 m/s2
  • B. 1.5 m/s2
  • C. 2.5 m/s2
  • D. 6.0 m/s2

Explanation: A car is travelling with uniform acceleration along a straight road. The road has marker posts every 100 m, d = 100 m Initial speed of the…

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Correct answer: 1.5 m/s2

512. A particle is travelling along a straight line OX. The distance x (in metre) of the particle from O at a time ′t′ is given by x = 37 +27t - t3 , where 't' is time in seconds. The distance of the particle from O, when it comes to rest is:

  • A. 81 m
  • B. 91 m
  • C. 101 m
  • D. 111 m

Explanation: Correct option is 91 m. (The solution involves calculus, which most pre-medical students will not be familiar with.

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Correct answer: 91 m

513. The third law of motion given by Newton deals with an action- reaction pair of forces. Consider two bodies: if the action is due to one body, the reaction will be due to:

  • A. The other body
  • B. The same body
  • C. Both the bodies
  • D. Atmosphere

Explanation: Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction…

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Correct answer: The other body

514. A bomb is dropped from an airplane moving horizontally with a speed of 200 km/h. If the air resistance is negligible, the bomb will reach the ground in 5 s, the altitude of the plane approximately is: (g = 9.8 m/s2)

  • A. 50 m
  • B. 75 m
  • C. 122.5 m
  • D. 250 m
  • E. 300 m

Explanation: Data:u = t = 5 sec v = 200km/hr Solution: h = ut + 1/2gt2h = 1/2 x 9.8(5)2h = 1/2 * 245= 122.5Hence, option C is correct.

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Correct answer: 122.5 m

515. Whenever the average and instantaneous velocities are equal the body is said to have a:

  • A. Simple velocity
  • B. Uniform velocity
  • C. Directional velocity
  • D. Centripetal velocity

Explanation: Instantaneous velocity can be equal to average velocity when the acceleration is zero or velocity is constant because in this condition…

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Correct answer: Uniform velocity

516. Two spheres of the same size, one of mass 5 kg and the other of mass 50 g are dropped simultaneously from a tower. When they are about to touch the ground, they have the same:

  • A. Kinetic Energy
  • B. Potential Energy
  • C. Momentum
  • D. Acceleration
  • E. All given options are correct

Explanation: When the two spheres are about to touch the ground, they will have the same acceleration due to gravity.

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Correct answer: Acceleration

517. The time rate of change of linear momentum of a body is equal to:

  • A. Force
  • B. Momentum
  • C. Power
  • D. Acceleration

Explanation: The force is defined as the rate of change of momentum which, if simplified, can be written as F=ma.

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Correct answer: Force

518. The velocity of an object increases from 0 to 10 m/s in 2 seconds. The distance covered by the object is _.

  • A. 10 m
  • B. 7.5 m
  • C. 05 m
  • D. 2.5 m

Explanation: Compute the value of acceleration, a, given that:Initial velocity=u=0Final velocity=v=10Time taken=t=2a=(u+v)/ta=(0+10)/2; a=5Now, use the…

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Correct answer: 10 m

519. In an inelastic collision, Momentum is _ and Kinetic Energy is _ respectively.

  • A. Not conserved ; not conserved
  • B. conserved ; not conserved
  • C. Conserved ; conserved
  • D. Not conserved ; conserved

Explanation: For elastic and inelastic collisions, momentum and total energy are always conserved provided no external force is applied; however, for…

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Correct answer: conserved ; not conserved

520. An object is thrown vertically upward with a velocity of 20 m/s. How much time it will take to reach the highest point?

  • A. 2 sec
  • B. 4 sec
  • C. 1 sec
  • D. Insufficient information

Explanation: The body is thrown vertically upwards with velocity of 20 m/s , it means initial velocity is 20 m/s.

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Correct answer: 2 sec
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