Explanation Given: Height of point 1 from reference = 32 m Height of point 2 , from reference = 0 m Point 2 is taken as reference point Speed of ball at point 1 ( v 1 ) =1 .30 m/s Distance travelled by roller -coaster = 45 .0 m Friction force =0 .23 ( W r ) W r : Weight of roller coaster FormulaUsed: W N C = Δ K E + Δ P E W N C : Work done by non-conservative forces. Δ K.E : change in kinetic energy Δ P.E : change in potential energy W f = - F f × S F f : Frictional force S : distance travelled Calculation: Potential energy at point 1 = m g h 1 P . E 1 = m × 9.8 × 32 Potential energy at point 2 = m g h 2 P E 2 = m × 9 .8×0 =0 Kinetic energy at point 1 = 1 2 m v 1 2 = 1 2 × m × ( 1.30 ) 2 Kinetic energy at point 2 = 1 2 m v 2 2 = 1 2 × m v 2 2 W N C = - 0

7th Edition

ISBN: 9780321733627

Author: Douglas C. Giancoli

Publisher: PEARSON

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.

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Chapter 6, Problem 50P

To determine

The speed which theroller coaster reaches point 2.

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Chapter 6, Problem 49P

Chapter 6, Problem 51P

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