CAIE IGCSE Physics 1.7.1.5 Recall Use for the Change in Questions

Practise calculating gravitational potential energy changes with ΔEₚ = mgΔh and analysing mass, field strength and height using CAIE IGCSE Physics questions and mark schemes.

Exam points

Calculate gravitational potential energy changes using ΔEₚ = mgΔh.

[Maximum number: 3]

A ball of mass 130 g is launched from the ground at an initial velocity of $14 \mathrm{~m} / \mathrm{s}$ vertically upwards. It decelerates until it is at rest momentarily at a height h above the ground.

Calculate h. Ignore the effect of air resistance.

10 m
(initial) $E_{\mathrm{k}}$ of ball =( maximum $) E_{\mathrm{p}}$ gained $\mathbf{OR} \frac{1}{2} m v^{2}=m g h$ $(h=) E_{\mathrm{p}} / m g \mathbf{OR}(h=) \frac{1}{2} V^{2} / g \mathbf{OR}(h=) 12.74 /(0.13 \times 9.8)(=10 \mathrm{~m}) \mathbf{OR}(h=)\left(\frac{1}{2} \times 196\right) / 9.8$

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CAIE IGCSE Physics 1.7.1.5 Recall Use for the Change in Questions question 1