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2 marksDynamics: Motion in a Straight Line

CSEC Physics · 1997 · Paper 2 · Question 2(c)(iii)

A car is travelling along a level road at 50 km h⁻¹. The car speeds up to 80 km h⁻¹. The driver finds that she has to keep her foot pressed harder on the gas pedal if she wishes to stay at this speed.

Explain why the driver of the car must push harder on the gas pedal to keep the car moving at 80 km h⁻¹.

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Other parts of this question

  1. 2(a)Distinguish between vector and scalar quantities.[2 marks]
  2. 2(b)(i)Find the distance travelled in the 20 s.[1 mark]
  3. 2(b)(ii)Find the average speed of the car.[2 marks]
  4. 2(b)(iii)What is the average velocity for the complete journey?[1 mark]
  5. 2(c)(i)How would Aristotle's 'law of motion' explain this observation?[2 marks]
  6. 2(c)(ii)Complete the following statement of Newton's first law of motion: If the resultant force on a body is zero it will remain at rest or ...[1 mark]
  7. 2(d)The pilot flies the plane at 80 km h⁻¹, due south relative to the air. Use a scale diagram to find with what velocity and in what direction the plane will…[5 marks]

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