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Class 9 · Science · Chapter 8

A car speeds up uniformly from 18 km/h to 36 km/h in 5 s. Find its acceleration and the distance it covers in this time.

Class 9 · Science · Chapter 9

State the law of conservation of momentum and use it to explain why a rifle recoils when a bullet is fired.

Class 9 · Science · Chapter 8

A car starting from rest reaches 20 m/s in 5 s. Find its acceleration and the distance covered.

Class 9 · Science · Chapter 9

State the law of conservation of momentum.

Class 9 · Science · Chapter 9

Balanced forces do not change the state of motion of an object; unbalanced forces do. Newton's first law states that an object stays at res…

Class 9 · Science · Chapter 8

An object is in motion when its position changes with time. Distance is the total path length covered (a scalar); displacement is the short…

Class 9 · Science · Chapter 9

Force: F = ma (SI unit: newton, N) Momentum: p = mv (SI unit: kg·m/s) Second law: F = (mv − mu)/t Impulse: F × t = mv − mu (change in momen…