Simulation · Physics · Class 11
Friction is not always μN
"Friction is not always μN" is a free, interactive Class 11 Physics simulation for NEET and JEE, built on the lesson "Solving problems in mechanics" in Laws of Motion. Pull the 5 kg block at an angle. What does the angle do to the normal force, and to the friction? JEE Main asked 39 questions from this chapter across the 42 shifts Lumi has analysed (2017–2026).
From the lesson Solving problems in mechanics in Laws of Motion. Change the values and watch what happens.
Friction is not always μNPhysics · Class 11
In JEE Main
42 shifts analysed
39 questions from Laws of Motion across the 42 JEE Main shifts Lumi has analysed (2017–2026).
The idea behind it
NCERT § "Solving Problems in Mechanics"
- Pick the body (or system) and draw a free-body diagram showing every force acting on it, and only those forces.
- Choose axes, usually along and perpendicular to the direction of acceleration, and write the second law separately for each axis.
- For connected bodies, the string condition gives the same magnitude of acceleration for both bodies and, for a light string, the same tension at both ends.
- Treating connected bodies as one system gives the common acceleration quickly, because internal tensions cancel; a separate free-body diagram is then needed to find the tension.
- For two masses m₁ > m₂ hanging over a light frictionless pulley, a = (m₁ − m₂)g/(m₁ + m₂) and T = 2m₁m₂g/(m₁ + m₂).
- With friction on connected bodies, first check whether the driving force exceeds limiting static friction; if not, the system stays at rest and friction equals the driving force.
- When a force is applied at an angle to a floor, its vertical component changes the normal reaction and therefore the friction.
Questions
3 answers
- What does the "Friction is not always μN" simulation show?
- Pull the 5 kg block at an angle. What does the angle do to the normal force, and to the friction?
- Does JEE Main ask questions from Laws of Motion?
- Yes. JEE Main asked 39 questions from this chapter across the 42 shifts Lumi has analysed (2017–2026).
- Is this simulation free?
- Yes. It is free and runs in the browser on a phone or a laptop. It belongs to the lesson "Solving problems in mechanics" in Laws of Motion (Class 11 Physics).
Embed this simulation
Free, with a link back
Teaching this idea? Put the simulation on your own page or LMS with this code.