A cookie jar is moving up a 40 incline. At a point 55 cm from the bottom of the incline (measured along the incline), the jar has a speed of 1.4 m/s. The coefficient of kinetic friction between jar and incline is 0.15. (a) How much farther up the incline will the jar move? (b) How fast will it be going when it has slid back to the bottom of the incline? (c) Do the answers to (a) and (b) increase, decrease, or remain the same if we decrease the coefficient of kinetic friction (but do not change the given speed or location)?
A cookie jar is moving up a 40 incline. At a point 55 cm from the bottom of the incline (measured along the incline), the jar has a speed of 1.4 m/s. The coefficient of kinetic friction between jar and incline is 0.15. (a) How much farther up the incline will the jar move? (b) How fast will it be going when it has slid back to the bottom of the incline? (c) Do the answers to (a) and (b) increase, decrease, or remain the same if we decrease the coefficient of kinetic friction (but do not change the given speed or location)?
Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter5: Displacement And Force In Two Dimensions
Section: Chapter Questions
Problem 8STP
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A cookie jar is moving up a 40 incline. At a point 55 cm
from the bottom of the incline (measured along the incline), the jar
has a speed of 1.4 m/s. The coefficient of kinetic friction between
jar and incline is 0.15. (a) How much farther up the incline will the
jar move? (b) How fast will it be going when it has slid back to the
bottom of the incline? (c) Do the answers to (a) and (b) increase,
decrease, or remain the same if we decrease the coefficient of kinetic
friction (but do not change the given speed or location)?
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a) Kinetic frictional force acting on the jar.
VIEW Apply the energy conservation law
VIEWb)Speed of object when it returns to the bottom of incline.
VIEWApply the energy conservation law at the top point and the bottom point.
VIEWc) Change in answers when the value of kinetic friction coefficient is decreased.
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