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 59 of 71
1161. An aeroplane 400 m north and 300 m south and then flies 1200 m upwards then net displacement is?
- A. 1200 m
- B. 1300 m
- C. 1400 m
- D. 1500 m
Explanation: An aeroplane flies 400 m north and 300 m south so the net displacement is 100 m towards north.
Correct answer: 1300 m1162. If an object is moving with constant velocity of 20ms-1 towards north then its acceleration will be
- A. 5 m s-2
- B. 9 m s-2
- C. 10 m s-2
- D. 0 m s-2
Explanation: Since velocity is constant so acceleration is zero.
Correct answer: 0 m s-2- 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 constants, providing no external force acts
Explanation: Let's analyze each option to determine which one represents the principle of conservation of momentum: A) A force is equal to the rate of…
Correct answer: The total momentum of a system of interacting bodies remains constants, providing no external force acts- A. 26 s
- B. 6s
- C. 5s
- D. 2s
Explanation: Force is the rate of change of momentum. F = Δp / Δ t ==> F = mΔv / Δt F = 6 N ; m = 1 kg ; Δv = 30 - 0 = 30 m/s ; Δt = ?
Correct answer: 5s- A. The same body
- B. Different bodies
- C. The horizontal surface
- D. Nothing can be said
Explanation: The following is the solution: Action and reaction never act on the same body.
Correct answer: Different bodies- A. Their velocities will be interchanged
- B. Velocities of both bodies will be zero
- C. Moving body will continue its motion
- D. Moving body will come at rest and the mass at rest will start its motion
Explanation: The following is the solution: In a one-dimensional elastic collision of two bodies of equal mass, the velocities of the two bodies will…
Correct answer: Their velocities will be interchanged- A. Changes with time
- B. Becomes zero
- C. Remains constant
- D. Increase with time
Explanation: The following is the solution: The horizontal component of velocity is the component of the initial velocity that is parallel to the…
Correct answer: Remains constant- A. 30°
- B. 45o
- C. 60o
- D. 90o
Explanation: The following is the solution: Option B is correct because a long jumper should jump at an angle of 45 degrees to maximize the horizontal…
Correct answer: 45o- A. R
- B. R/2
- C. 2R
- D. R/4
Explanation: The range of a projectile depends on the initial velocity and the angle of projection but is independent of the mass of the projectile.
Correct answer: R- A. The mass of the projectile
- B. The velocity of the projection
- C. The angle of the projection
- D. The angle as well as the velocity of the projection
Explanation: The horizontal range R of a projectile is the horizontal distance traveled by the projectile before hitting the ground.
Correct answer: The angle as well as the velocity of the projection- A. 300
- B. 450
- C. 600
- D. 900
Explanation: The horizontal range of a projectile is maximum when the angle of projection is 45 degrees.
Correct answer: 450- A. 4: 5
- B. 7:9
- C. 16:25
- D. 1:1
Explanation: The distance moved by a freely falling body in the nth second of its motion is given by the formula dn =u+1/2 g(2n−1), where u is the…
Correct answer: 7:9- A. 24km/s
- B. 11km/s
- C. 5.5km/s
- D. 16.5km/
Explanation: Escape velocity is (ve ) is given by the formula:ve = √2GM/R
Correct answer: 5.5km/s1174. A ball is just allowed to fall from the window of a moving train it will hit the ground following
- A. Circular path
- B. Hyperbolic path
- C. Straight line path
- D. Parabolic path
Explanation: When a ball is allowed to fall from the window of a moving train, it will follow a parabolic path.
Correct answer: Parabolic path- A. 24km/s
- B. 11km/s
- C. 5.5km/s
- D. 16.5km/s
Explanation: Escape velocity is (ve ) is given by the formula:ve = √2GM/R
Correct answer: 5.5km/s- A. Angular momentum and Planck constant:
- B. Moment of inertia and moment of force
- C. Work and torque
- D. Impulse and momentum
Explanation: Correct. Moment of inertia has dimensions \(kg \cdot m^2\), and moment of force has dimensions \(N \cdot m\)In summary, the correct option…
Correct answer: Moment of inertia and moment of force- A. 1560m, 540m
- B. 2560m, 640m
- C. 3560m, 740m
- D. 4560m, 840m
- E. 9595m, 348m
Explanation: Following is the solution to this question:
Correct answer: 2560m, 640m- A. 9.8 / √2 m
- B. 9.8 √3 m
- C. 9.8 m
- D. 4.9 m
- E. 3.1 m
Explanation: Attached below is the solution to the question above:
Correct answer: 9.8 m- A. √(2u/g)
- B. None of these
- C. √(2g/u)
- D. √(2h/g)
Explanation: The formula for calculating the time of the flight is: √(2h/g)
Correct answer: √(2h/g)- A. Tan-1 (45)
- B. Tan-1 (60)
- C. Tan-1 (30)
- D. None
Explanation: We will make use of the formulas: Options A, B, and C are all wrong as they give wrong numerical values.
Correct answer: None