NEET · Class 11 Physics
Laws of Motion MCQs for NEET
Laws of Motion is where most NEET Physics scores are won or lost, because almost every mechanics question uses a free-body diagram from this chapter. Try these questions, read the working for each answer, then take a full 10-question test on the chapter in the app.
Take the free 10-question testPractice questions on Laws of Motion
Q1. A block of mass 2 kg rests on a horizontal surface with μs = 0.4. What minimum horizontal force will just start moving it? (g = 10 m/s²)
Q2. A man of mass 60 kg stands in a lift accelerating upward at 2 m/s². His apparent weight is (g = 10 m/s²):
Q3. Two blocks of 3 kg and 2 kg are in contact on a smooth floor. A force of 10 N pushes the 3 kg block. The contact force between them is:
Q4. A cyclist takes a turn of radius 20 m on a road banked at angle θ with no friction. If the safe speed is 10 m/s, tanθ equals (g = 10 m/s²):
Q5. A body of mass 5 kg moving at 4 m/s is stopped in 2 s. The average force applied is:
Quick NCERT recap
- Newton's first law defines inertia: a body keeps its state of rest or uniform motion unless a net external force acts.
- Second law: F = dp/dt, and for constant mass F = ma. Force and acceleration are always in the same direction.
- Third law: action and reaction are equal, opposite, and act on two different bodies — they never cancel each other.
- Friction: f_static(max) = μs·N and f_kinetic = μk·N, with μk slightly less than μs.
- For a body on a banked road of angle θ, the safe speed without friction is v = √(r·g·tanθ).
- In a lift accelerating upward with a, apparent weight = m(g + a); in free fall it is zero.
Exam tips for this chapter
- Draw the free-body diagram first, every single time — most wrong answers come from a missing force, not from bad algebra.
- Resolve along and perpendicular to the incline, not along x and y, when a slope is involved.
- Check whether the body is about to slip or already sliding before choosing μs or μk.
- NEET repeats connected-block and pulley questions; practise them until the constraint relation is automatic.
Common questions
How many questions come from Laws of Motion in NEET?
Usually one to two direct questions, but the ideas are used again in work-energy, circular motion and rotational mechanics, so the real weight is much higher.
Do I need to memorise formulas for this chapter?
Very few. F = ma, f = μN and v = √(rg·tanθ) cover most questions. The rest is drawing the correct free-body diagram.
Where can I take a full test on this chapter?
Open the free 10-question test in the app. It scores you instantly and brings the chapter back on Day 1, 3, 8 and 20 so you do not forget it.