An excavator has a heavy diesel engine and is equipped with wide caterpillar tracks to move across soft, muddy ground at a construction site.
State the standard SI unit of energy.
State the useful energy obtained from the diesel engine as the excavator starts to move.
State two other (wasted) forms of energy output from the diesel engine.
Complete the following sentence by choosing the correct term:
An excavator engine that wastes less fuel energy to perform the same amount of work is \text{_______} (faster / more efficient / more powerful).
The excavator is several times heavier than a standard car. A car easily sinks and gets stuck in the soft mud, but the heavy excavator does not sink.
Explain why this is, referring to force, area, and pressure in your answer.
188 exam-style questions on CIE IGCSE Physics Pressure, covering Pressure. Each one has a worked solution and a mark scheme showing where the marks go.