Ten ways to make it stick — plus the engine that keeps it there.

Why the same push moves things differently

Give an empty shopping trolley a small shove and it shoots off. Load it with groceries and the same shove barely moves it — that's mass resisting acceleration.

State Newton's Second Law of Motion.

The rate of change of momentum of a body is directly proportional to the applied net force and takes place in the direction of the force.

F = dp/dt

Constant mass → F = ma. Use dp/dt whenever mass changes — rockets, conveyor belts.

OIL RIG

Oxidation Is Loss, Reduction Is Gain — the standard hook for redox reactions, Class 10–11 Chemistry.

Label the parts of an animal cell.

Cell membrane around the outside, cytoplasm filling the inside, the nucleus at the centre, and the mitochondrion nearby — the four labels on the real diagram.

See "mass is changing" → use F = dp/dt

A rocket burning fuel, a raindrop gathering mass — whenever the setup mentions changing mass, F = ma quietly breaks. Reach for the general form instead.

Constant mass, constant force. What stays constant?

Acceleration. Velocity, momentum and kinetic energy all keep changing as the body speeds up — only a = F/m holds steady.

Writing F = ma for a rocket as it launches

A rocket burns fuel, so its mass keeps falling — m isn't constant, and F = ma quietly breaks. Use F = dp/dt instead.

A lift accelerates upward at 2 m/s². Apparent weight of a 60 kg person?

Add ma to mg: the scale reads more than actual weight while accelerating up — a JEE/NEET-style application of Newton's second law.