CAIE IGCSE Physics 1.6.2 Impulse As Force Time for Which Questions

Practise explaining impulse as the change in momentum and using force–time equations with CAIE IGCSE Physics questions and mark schemes.

Exam points

Explain impulse as the change in momentum and use impulse equations involving force and time.

[Maximum number: 4]

Fig. 3.1 shows two children balanced on a seesaw. A seesaw is a length of wood which rotates about a central pivot.

Fig. 3.1

(a)

The concrete floor under the seesaw is replaced with a rubber floor. A child falls from the seesaw and experiences an impulse when they hit the floor.

[ 4 ]

(i)

Define impulse.

[ 1 ]

(impulse is the) force × time (for which the force acts) $\mathbf{OR} I=F \times t$

OR (impulse = ) change in momentum OR $\Delta\{m v\}$

(ii)

Explain how the rubber floor reduces injury to the child.

Use ideas about impulse, force, momentum and time in your answer.
[Total: 8]

[ 3 ]

any three from:

- change in momentum/impulse is the same (on both floors)

- (change in momentum/lmpulse) is over longer time

- force = rate of change of momentum OR $F=\Delta\{m v\} / \Delta t$

- less force on child (so less injury)

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CAIE IGCSE Physics 1.6.2 Impulse As Force Time for Which Questions question 1

Question (a)

Question (i)

Question (ii)