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Start Vo = 0 h = 25 m h = 20 m Finish V = ? Figure 7.8 The speed of a roller coaster increases as gravity pulls it downhill and is greatest at its lowest point. Viewed in terms of energy, the roller-coaster-Earth system's gravitational potential energy is converted to kinetic energy. If work done by friction is negligible, all APE, is converted to KE.

Start Vo = 0 h = 25 m h = 20 m Finish V = ? Figure 7.8 The speed of a roller coaster increases as gravity pulls it downhill and is greatest at its lowest point. Viewed in terms of energy, the roller-coaster-Earth system's gravitational potential energy is converted to kinetic energy. If work done by friction is negligible, all APE, is converted to KE.

University Physics Volume 1
University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter8: Potential Energy And Conservation Of Energy
Section: Chapter Questions
Problem 59P: In the movie Monty Python and the Holy Grail (https://openstaxcollege. org/l/21monpytmovcl) a cow is...
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(a) What is the final speed of the roller coaster shown if it starts from rest at the top of the 20.0 m hill and work done by frictional forces is negligible?

(b) What is its final speed (again assuming negligible friction) if its initial speed is 5.00 m/s?

Start Vo = 0 h = 25 m h = 20 m Finish V = ? Figure 7.8 The speed of a roller coaster increases as gravity pulls it downhill and is greatest at its lowest point. Viewed in terms of energy, the roller-coaster-Earth system's gravitational potential energy is converted to kinetic energy. If work done by friction is negligible, all APE, is converted to KE.
Transcribed Image Text:Start Vo = 0 h = 25 m h = 20 m Finish V = ? Figure 7.8 The speed of a roller coaster increases as gravity pulls it downhill and is greatest at its lowest point. Viewed in terms of energy, the roller-coaster-Earth system's gravitational potential energy is converted to kinetic energy. If work done by friction is negligible, all APE, is converted to KE.
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