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Edexcel A-Level Physics AS 1.3.20 Conservation of Energy Questions

Practise Edexcel IAL Physics 1.1.20 by tracking gravitational, kinetic and dissipated energy to judge heights, loops and braking.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Physics XPH11/YPH11
Level
AS

Exam points

  • equate loss of gravitational potential energy to kinetic energy or useful work
  • include dissipated energy from friction, drag or braking when applying energy conservation
  • judge whether an object completes a loop or reaches a height from available energy

Edexcel A-Level Physics AS 1.3.20 Conservation of Energy Questions question 1

[Maximum number: 5]

The luge is an event at the Winter Olympics. An athlete lies on a small sledge and races down an icy track, feet first.

Figure for Question Edexcel A-Level Physics AS 1.3.20 Conservation of Energy Questions question 1 — Edexcel A-Level Physics AS

After the finish line there is a straight, uphill section of track for the sledge to decelerate in. The maximum permitted gradient of this section is 20%.

Figure for Question Edexcel A-Level Physics AS 1.3.20 Conservation of Energy Questions question 1 — Edexcel A-Level Physics AS

An athlete reaches the finish line at a velocity of 33 m s−133 \mathrm{~m} \mathrm{~s}^{-1}. She then applies a minimum braking force of 240 N as she moves along the uphill section of track to help her come to a stop.

Calculate the minimum uphill length of track L that should be available for braking. You should ignore all frictional forces other than those applied by the athlete.
mass of sledge and athlete =95 kg=95 \mathrm{~kg}

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