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Laws of Motion looks easy until the question puts two bodies on one string, or a block inside a lift. Then it stops being easy. Ten questions below, with the answer key and a hint for each.
What this chapter carries in NEET(UG)
- Usually 2 to 3 questions every year, which is 8 to 12 marks.
- Most of them come from free body diagrams, friction, connected bodies and apparent weight in a lift.
- Almost every mistake in this chapter comes from a free body diagram that was never drawn.
What the syllabus says
In the syllabus (Unit 3, Laws of Motion): Force and inertia, Newton’s three laws of motion, momentum, impulse, conservation of linear momentum and its applications, equilibrium of concurrent forces, static and kinetic friction, laws of friction, rolling friction, dynamics of uniform circular motion, centripetal force, a vehicle on a level circular road and on a banked road.
Taken out in 2024: lubrication.
Taken from the NMC syllabus for NEET (UG) 2026, the latest one published. See the full syllabus, unit by unit.
Formulas you must know by heart
| Newton’s second law | F = ma |
| Momentum | p = mv |
| Impulse | FΔt = Δp |
| Friction | f = μN |
| Body on a smooth incline | a = g sin θ |
| Apparent weight, lift going up with a | N = m(g + a) |
| Apparent weight, lift going down with a | N = m(g − a) |
| Two connected bodies pulled by F | a = F / (m1 + m2) |
Draw the free body diagram first, every single time. Students who skip it lose marks they already knew how to earn.
Ten questions. Give yourself ten minutes.
Write your answers down before you scroll. A question you looked up is a question you have not answered.
Q1. A force of 10 N acts on a body of mass 2 kg. The acceleration produced is
- (a) 0.2 m/s²
- (b) 2 m/s²
- (c) 5 m/s²
- (d) 20 m/s²
Q2. Newton’s first law of motion gives us the idea of
- (a) force
- (b) inertia
- (c) momentum
- (d) energy
Q3. Action and reaction forces are equal and opposite, but they never cancel each other because they
- (a) act at different times
- (b) act on different bodies
- (c) are not really equal
- (d) act in the same direction
Q4. A block of mass 5 kg rests on a surface with coefficient of friction 0.2. Taking g = 10 m/s², the maximum friction force is
- (a) 1 N
- (b) 10 N
- (c) 25 N
- (d) 50 N
Q5. A person of mass m stands in a lift that is moving upward with acceleration a. The reading of the weighing machine is
- (a) mg
- (b) m(g − a)
- (c) m(g + a)
- (d) ma
Q6. A body of mass 2 kg moving at 5 m/s is brought to rest in 2 s. The average force needed is
- (a) 2 N
- (b) 5 N
- (c) 10 N
- (d) 20 N
Q7. Two blocks of 2 kg and 3 kg are joined by a light string and pulled along a smooth floor by a force of 10 N. The acceleration of the system is
- (a) 1 m/s²
- (b) 2 m/s²
- (c) 3.3 m/s²
- (d) 5 m/s²
Q8. A block slides down a smooth incline of angle 30°. Taking g = 10 m/s², its acceleration is
- (a) 2.5 m/s²
- (b) 5 m/s²
- (c) 8.7 m/s²
- (d) 10 m/s²
Q9. The impulse given to a body is equal to its change in
- (a) velocity
- (b) momentum
- (c) kinetic energy
- (d) acceleration
Q10. For the same pair of surfaces, the force needed to start a body moving is generally
- (a) less than that needed to keep it moving
- (b) the same as that needed to keep it moving
- (c) more than that needed to keep it moving
- (d) zero
Answer key, with a hint for each
| Q1 | (c) | a = F/m = 10/2 = 5 m/s². |
| Q2 | (b) | A body keeps doing what it was doing unless a force acts. That property is inertia. |
| Q3 | (b) | They act on two different bodies, so they can never add up to zero on one body. |
| Q4 | (b) | f = μN = 0.2 × 5 × 10 = 10 N. |
| Q5 | (c) | Going up with acceleration a, the floor must push harder: N = m(g + a). |
| Q6 | (b) | F = Δp/Δt = (2 × 5)/2 = 5 N. |
| Q7 | (b) | a = F/(m1 + m2) = 10/5 = 2 m/s². The string tension is not needed for this part. |
| Q8 | (b) | a = g sin θ = 10 × 0.5 = 5 m/s². Mass does not appear. |
| Q9 | (b) | FΔt = Δp. Impulse is change in momentum, not change in velocity. |
| Q10 | (c) | Static friction is usually larger than kinetic friction, so starting is harder than keeping going. |
Now mark yourself honestly
NEET(UG) marks the way it marks. Use the same rule here:
- +4 for a right answer
- −1 for a wrong one
- 0 for a blank
So ten questions here are out of 40. In the real paper, 45 Physics questions are out of 180.
If you scored 32 or more, the basics of this chapter are secure. Move to harder questions, not more of these.
If you scored below 24, do not feel bad about it. You have just found out something useful before the exam did. Go back to the formula table above, learn it properly, and sit these ten again tomorrow.
And if you guessed a few and they landed, count those as wrong. A guess that works once will not work in May.
The full chapter, on a clock
Ten questions tell you a little. Forty-five tell you the truth.
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