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NEET Laws of Motion: 5 practice MCQs with answers

By the PrepMatic team · Updated 9 Oct 2026 · 4 min read

Laws of Motion connects forces to acceleration, and its ideas return in almost every later Physics chapter, from circular motion to electromagnetism. The five MCQs below cover Newton's second law, lift problems, impulse, static friction and recoil. They are at NCERT Class 11 level, so none needs a trick.

What this chapter covers in the NEET syllabus

In the NMC syllabus this is the unit Laws of Motion, and in NCERT it is the Class 11 chapter of the same name. The topics are:

• Newton's three laws, inertia, and free-body diagrams.
• Momentum, impulse and the conservation of linear momentum.
• Equilibrium of concurrent forces.
• Static and kinetic friction, the angle of friction and motion on an inclined plane.
• Motion of connected bodies, pulleys and bodies in a lift (apparent weight).
• Dynamics of uniform circular motion and the banking of roads.

Five practice MCQs on Laws of Motion

Question 1

A block of mass 2 kg on a frictionless horizontal surface is pulled by a horizontal force of 10 N. Its acceleration is:

• A. 20 m/s²
• B. 0.2 m/s²
• C. 5 m/s²
• D. 8 m/s²

Question 2

A man of mass 60 kg stands in a lift that accelerates upward at 2 m/s². Taking g = 10 m/s², the reading of a weighing scale on which he stands is:

• A. 600 N
• B. 480 N
• C. 120 N
• D. 720 N

Question 3

A ball of mass 0.5 kg moving at 10 m/s strikes a wall normally and rebounds with the same speed. The magnitude of the impulse on the ball is:

• A. 10 N s
• B. 5 N s
• C. 0 N s
• D. 20 N s

Question 4

A block of mass 5 kg rests on a rough horizontal surface where the coefficient of static friction is 0.4. Taking g = 10 m/s², the maximum static friction force is:

• A. 2 N
• B. 20 N
• C. 50 N
• D. 12.5 N

Question 5

A gun of mass 4 kg fires a bullet of mass 20 g at a speed of 300 m/s. The recoil speed of the gun is:

• A. 1.5 m/s
• B. 15 m/s
• C. 0.15 m/s
• D. 3 m/s

Answers and explanations

1. C. By Newton's second law a = F/m = 10/2 = 5 m/s². Because the surface is frictionless, the pull is the only horizontal force.
2. D. In an upward-accelerating lift the scale reads N = m(g + a) = 60 × 12 = 720 N. It would read 480 N if the lift accelerated downward at 2 m/s², and 600 N if it moved at constant velocity.
3. A. Impulse equals the change in momentum. The momentum goes from +5 to −5 kg m/s, a change of magnitude 2mv = 2 × 0.5 × 10 = 10 N s. A common slip is to answer 5, which ignores the reversal of direction.
4. B. The maximum static friction is f = μsN = μs mg = 0.4 × 5 × 10 = 20 N. Below this value, friction exactly balances the applied force.
5. A. Total momentum is zero before firing, so it stays zero. Convert the bullet mass first: 20 g = 0.02 kg. Then 4V = 0.02 × 300, giving V = 1.5 m/s in the opposite direction.

How to prepare Laws of Motion

• Draw a free-body diagram every time. Mark only real forces: weight, normal reaction, tension, friction and applied force. Do not add "ma" as a force unless you work in an accelerating frame, where it is a pseudo force.
• Write F = ma along each axis separately. For an inclined plane, tilt the axes so that one runs along the slope. The component of weight along the slope is mg sin θ and perpendicular to it is mg cos θ.
• Learn the lift cases as one formula. Apparent weight is m(g + a) for upward acceleration and m(g − a) for downward acceleration. If the lift is in free fall, the apparent weight is zero.
• Keep units tidy. Grams to kilograms and km/h to m/s are the usual traps in recoil and impulse questions.
• Separate static from kinetic friction. Friction adjusts up to μsN, and once the body slides it becomes the constant μkN.

Connected-body and pulley problems take practice, so solve at least ten of them with different masses until setting up the equations is automatic. Chapter priorities for the whole subject are in the NEET Physics preparation guide, and the unit list is in the NEET syllabus.

Take a full Laws of Motion test on PrepMatic

Once you can draw free-body diagrams without hesitation, try a timed topic test on PrepMatic, about 15 questions in 30 minutes. Results use NEET's negative marking, so you will see how often sign and unit slips cost marks. Topic tests are part of the free Basic plan, and the practice hub has more chapters.

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