CAIE IGCSE Physics 1.6.4 Resultant force as change in momentum

Practise resultant force as the rate of change of momentum, connecting force size to how quickly momentum changes over time.

Exam points

use F = Δp/Δt to calculate resultant force from a momentum change
explain why a longer stopping time reduces the force for the same Δp

[Maximum number: 2]

A different train is travelling with a momentum of $0.26 \mathrm{~kg} \mathrm{~m} / \mathrm{s}$ .

The train slows down and stops after 2.1 s .
Calculate the average force acting on the train during this time.

average force =

$(-) 0.12 \mathrm{~N}$

A2

$F \Delta t=\Delta\{m v\} \mathbf{O R}(F=) \Delta p \div(\Delta) t \mathbf{O R}(F=) \Delta\{m v\} \div(\Delta) t \mathbf{O R}(F=) 0.26 \div 2.1$

C1

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1.6.4—Resultant force as change in momentum question 1