IB Physics HL A 3 5 Work Energy Change Questions

Practise HL work–energy calculations across ramps, rough surfaces, force graphs, electric fields and spacecraft energy changes.

Exam points

Combine gravitational, kinetic and frictional changes to solve multi-stage motion on ramps and rough surfaces.
Use acceleration–distance or force–distance data with work–energy to calculate speed, distance or work.
Analyse energy changes in fields and spacecraft, including work done by forces and thermal losses from resistance.

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Study A.3.5—Work-energy change conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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

Figure for Question IB Physics HL A 3 5 Work Energy Change Questions question 1 — IB Physics HL

The sledge, without the girl on it, now travels up a snow slope that makes an angle of $6.5^{\circ}$ to the horizontal. At the start of the slope, the speed of the sledge is $4.2 \mathrm{~m} \mathrm{~s}^{-1}$ . The coefficient of dynamic friction of the sledge on the snow is 0.11 .

Calculate the distance along the slope at which the sledge stops moving.

Assume that the coefficient of dynamic friction is constant.

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IB Physics HL A 3 5 Work Energy Change Questions question 1