session.masteringphysics.com HWCh6 Problem 6.3 Resources « previous | 2 of 9 nex

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session.masteringphysics.com HWCh6 Problem 6.3 Resources « previous | 2 of 9 nex Problem 6.3 Part A A 2.3-kg block slides on a horizontal surface with a speed of u = 0.80m/s and an acceleration of magnitude a 3.0m/s), as shown in (Figure-1) What is the coefficient of kinetic friction between the block and the surface? Express your answer to two significant figures. O? Submit My Answers Give Up Part B When the speed of the block slows to 0.40 m/s, is the magnitude of the acceleration greater than, less than, or equal to 3.0 m/s2? Less than 3.0 m/s2 .Equal to 3.0 m/s2

Explanation / Answer

a) Net force = f

F = mu * m g

m a = mu * m g

mu = a / g = 3.0 / 9.81

coefficient of kinetic friction mu= 0.306

b) acceleration = v - u / t

As the velocity is decreasing v is less than u, acceleration is negative

so it is less than 3.0 m/s2

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