Edexcel A-Level Physics AS 1.3.21 Power Time and Energy Transfer Questions

Practise Edexcel IAL Physics 1.1.21 by calculating power, force and transferred energy and comparing motor, water and heater systems.

Exam points

use P=E/t, W/t or P=Fv to calculate power, force, time or transferred energy
convert or compare joules, watts and kilowatt-hours in energy-transfer contexts
assess claims by comparing power-time energy transfers from motors, water or heaters

[Maximum number: 2]

The diagram shows a system used to move a stone block up a ramp. A team of people uses a rope to pull the block at a constant speed.

Figure for Question Edexcel A-Level Physics AS 1.3.21 Power Time and Energy Transfer Questions question 1 — Edexcel A-Level Physics AS

height of ramp $=4.35 \mathrm{~m}$
angle of ramp to horizontal $=6.0^{\circ}$
mass of block $=2.10 \times 10^{3} \mathrm{~kg}$
speed of block up ramp $=0.450 \mathrm{~m} \mathrm{~s}^{-1}$
total power of team $=6.25 \mathrm{~kW}$

Show that the total force that the team exerts on the block is about 14 kN .
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Use of P=W / t and $\Delta W=F \Delta s$

Force = 13.9(kN)

Example of calculation

In 1 second $W=6250 \mathrm{~J}$ and distance travelled $=0.450 \mathrm{~m}$ $F=6250 \mathrm{~W} \div 0.450 \mathrm{~m} \mathrm{~s}^{-1}=13.9 \mathrm{kN}$

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Edexcel A-Level Physics AS 1.3.21 Power Time and Energy Transfer Questions question 1