Counterexample

Is this true?

The generalised momentum $\partial{}L/\partial{}q$ ̇ always equals mass × velocity

No — it is false.

The counterexample

The object that kills this claim comes with Trap Analysis.

86 counterexamples are free — including most of the ones Part C leans on hardest.

Keep practicing

Execution slip

The idea was right. The computation was not.

The Hamiltonian always equals the total energy

See real exam options built on this mistake Drill statements like this

Go deeper· Explained in full in Lagrangian mechanics· Asked in CSIR NET June 2025· From Classical Mechanics › Lagrangian formalism and generalised coordinates

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