CAIE A-Level Physics AS 5.2.1 W Fs the Formula Ep Mg H for Gravitational Potential Energy Changes in Questions

Calculate work done and changes in gravitational potential energy using W = Fs and ΔEP = mgΔh.

Exam points

Calculate work done and changes in gravitational potential energy using W = Fs and ΔEP = mgΔh.

[Maximum number: 2]

A mass m moves a vertical distance $\Delta h$ in a uniform gravitational field and gains gravitational potential energy $\Delta E_{\mathrm{p}}$ . The acceleration of free fall is g.

Use the concept of work done to show that

\Delta E_{\mathrm{P}}=m g \Delta h .

work (done) = force × displacement
( force =m g and distance $=\Delta h)$

(so) work (done) $=m g \Delta h$ and work $=\Delta E_{(\mathrm{P})}$ (so $\Delta \mathrm{E}_{(\mathrm{P})}=m g \Delta h$ )

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CAIE A-Level Physics AS 5.2.1 W Fs the Formula Ep Mg H for Gravitational Potential Energy Changes in Questions question 1