Mastering Physics: Homework #10 (phy 111) Adaptive Follow Google Chrome https://

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Mastering Physics: Homework #10 (phy 111) Adaptive Follow Google Chrome https:// mastering physics.com 55375586&offset; prev Session PHY 11 Fall 2015 Homework 10 (phy 111 Ada ve Follo Problem 6.25 0 N? Problem 5.25 Express your answer using two significant figures An 72 N box initially at rest is pulled by a horizontal rope on a horizontal table. The coefficients of kinetic and static friction between the box and the table are and respectively. What is the friction force on this box if the pull Submit My Answers Give Up Part B 26 N Express your answer using two significant figures Submit My Answers Give U Part C 35 N Express your answer using two significant figures signed in as Help Close Resources previous I Item 1 l next

Explanation / Answer

Normal Component acting on the block = Weight of block...
= 72N

coffecient of static friction = 1/2
coffecient of kinetic friction = 1/4

The Limiting Friction = coefficient of static friction * Normal Component
= 1/2 * 72 = 36N

If force applied is greater than limiting friction, then only Kinetic friction comes into play..

Kinetic friction = cof of kinetic friction * normal
= 1/4 * 72 = 18N

If the pull is a) 0 N..
The pull is less than limiting friction..
so
Friction = 36N

b)26N...
The pull is again less than limiting friction (36 N)
So
Friction = 36N

c)150N..
The pull is greater than limiting friction
So
Friction = 18N(Kinetic friction gets applied)

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