Lecture3%20Energy0

# Lecture3%20Energy0 - Today A bit more on Energy Skate Park...

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1 Today A bit more on Energy Skate Park Free fall: Objects moving under the influence of gravity. Concepts to understand Lecture 1-3: Conservation of Energy Energy Transfer Mechanical Energy Friction

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2 Worksheet 2 Questions 3d) What is the approximate amount of mechanical energy that is dissipated during the first cycle (almost complete return) if you start the skater near the top of the track and set 'friction' to 1 st division? A) 5100J B) 3800 J C) 1000 J D) 700 J E) 300 J
3 What will the speed of the 75kg Skater be at 2 seconds? PE = 0 at dotted line Total KE PE A. 14m/s B. 8.8m/s C. 8.0m/s D. 3.7m/s

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4 At what height is the 20kg Skater at 2 seconds? Total KE PE A) 6 m B) 4 m C) 2 m D) 1m E) Impossible to say without knowing the height of the track above ground.

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