Free Newton's Laws of Motion MCQs with Answers
83 Newton's Laws of 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.
Newton’s laws explain inertia, the relation between net force and acceleration, and action-reaction pairs. Questions involve free-body diagrams, balanced and unbalanced forces, F = ma, force as the rate of change of momentum, and identifying genuine third-law pairs, which act on different bodies.
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83 questions · page 4 of 5
- A. Linear acceleration is zero
- B. Angular acceleration is zero
- C. Linear acceleration is zero but angular acceleration is not zero
- D. Linear acceleration and angular acceleration both should be zero
Explanation: For a body to be in complete equilibrium, it must not experience any net force or torque.
Correct answer: Linear acceleration and angular acceleration both should be zero- A. 196 N
- B. 19.8 N
- C. 1.98 N
- D. 2 N
Explanation: 19.8 N: This option is the correct value for the tension 'T' when the elevator is descended with an acceleration of 0.1 m/s².
Correct answer: 19.8 N- A. Increased
- B. Decreased
- C. Reduced to zero
- D. Remain Constant
Explanation: As the elevator pushes upward, the downward force, i.e., weight, will appear to increase. Weff = mgeff geff = (g + a)
Correct answer: Increased- A. sin∅
- B. Cos∅
- C. Tan∅
- D. cot∅
Explanation: We know,f =uN .........(1)where u=coefficient of kinetic frictionN = normal forceN =mg cos ∅ (as in the diagram, N balances mgcos∅)and f=…
Correct answer: Tan∅- A. 2.45 ms-2
- B. 0.25 ms-2
- C. 4.9 ms-2
- D. 2.8 ms-2
Explanation: F=ma F is resultant force Force by 3 kg mass is 3 x 9.81 = 29.43 N BY 5 kg mass is 5 x 9.81 = 49.05 NThe resultant force is 49.05-29.43 =…
Correct answer: 2.45 ms-2- A. 9.8 N
- B. 13.8 N
- C. 5.8 N
- D. Zero
Explanation: Reading = mg - ma = (1)(9.8) - (1)(4)=9.8 - 4=5.8N
Correct answer: 5.8 N- A. 90N
- B. 60N
- C. 150N
- D. 100N
Explanation: The Correct Option is C as the person is moving with a net force of 150N in horizontal direction.
Correct answer: 150N- A. Zero
- B. 800 N upward
- C. 800 N downward
- D. 24 N downward
Explanation: The net force is zero bcz there is no acceleration. The strings of parachute are pulling against him in the upward direction with a force…
Correct answer: Zero- A. Sin θ
- B. Cos θ
- C. Tan θ
- D. Cot θ
Explanation: The coefficient of friction is a measure of the frictional force between the object and the surface it is sliding on.
Correct answer: Tan θ- A. Force and acceleration
- B. Mass and force
- C. Mass and velocity
- D. Acceleration and mass
Explanation: Newton's second law of motion states that the acceleration of an object is directly proportional to the net force applied to it and…
Correct answer: Force and acceleration- A. inertia of the body
- B. quantity of motion in the body
- C. Acceleration of body
- D. All of these
Explanation: Inertia means resistance to change. It is the property of the body by virtue of which it cannot change by itself its state of rest or of…
Correct answer: inertia of the body- A. 40 ms^-2
- B. 10 ms^-2
- C. 30 ms^-2
- D. 50 ms^-2
Explanation: In this scenario, the two blocks are in contact and can be treated as a single system with a total mass of 1.0 kg + 3.0 kg = 4.0 kg.
Correct answer: 10 ms^-2- A. Kinetic energy
- B. Velocity
- C. Momentum
- D. Acceleration
Explanation: For a body to be in equilibrium, it must have zero net acceleration, which is the result of all external forces canceling each other out.
Correct answer: Acceleration- A. The body speeds up
- B. The body rotates
- C. The body changes direction
- D. Mass of body decreases
Explanation: The correct answer is that the mass of the body decreases. The mass of a body is an intrinsic property that remains unchanged when a force…
Correct answer: Mass of body decreases- A. Is zero
- B. Is constant but not zero
- C. Increases uniformly with respect to time
- D. Is proportional to the displacement of the mass from a fixed point
Explanation: A mass accelerates uniformly when the resultant force acting on it is constant but not zero.
Correct answer: Is constant but not zero- A. Newton's 1st law of motion
- B. Newton's 2nd law of motion
- C. Newton's 3rd law of motion
- D. None of the above
Explanation: Newton's third law of motion states that every action will have an equal and opposite reaction.
Correct answer: Newton's 3rd law of motion- A. 800 N upwards?
- B. Zero
- C. 240 N downwards
- D. 360 N downwards
Explanation: Since force is found as the product of mass and acceleration, and acceleration in this case is 0 (as the parachute falls at a constant…
Correct answer: Zero- A. Moves upward with increasing speed
- B. Moves upward with decreasing speed
- C. Remains stationary
- D. Moves downward with increasing speed
Explanation: The correct answer is that the scale shows the highest reading when the elevator moves upward with increasing speed.
Correct answer: Moves upward with increasing speed- A. Newton's first law
- B. Newton's second law
- C. Both Options A and B are correct
- D. They are unrelated
Explanation: Newton's second law provides a mathematical description of force as it relates to mass and acceleration, forming the basis for…
Correct answer: Newton's second law- A. Increased speed
- B. Decreased the momentum
- C. Change the direction
- D. Keep it moving with uniform velocity
Explanation: According to Newton's law if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in…
Correct answer: Keep it moving with uniform velocity