IB Physics HL A.2.17 Momentum and Impulse

Practise analysing HL impulse and momentum data, including variable force graphs, collisions and rocket-engine dynamics.

Exam points

calculate impulse as the change in linear momentum of a system
use force–time data or average force to determine impulse and momentum change
apply signed impulse–momentum reasoning to collisions, rebounds and changing-force problems

[Maximum number: 3]

A girl on a sledge is moving down a snow slope at a uniform speed.

Figure for Question A.2.17—Impulse question 1 — IB Physics HL

The girl chooses to jump so that she lands on loosely-packed snow rather than frozen ice. Outline why she chooses to land on the snow.

same change in momentum/impulse the time taken «to stop» would be greater «with the snow»

$F=\frac{\Delta p}{\Delta t}$ therefore F is smaller «with the snow»

OR

force is proportional to rate of change of momentum therefore F is smaller «with the snow»

Marking guidance:

Allow reverse argument for ice

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A.2.17—Impulse question 1