Home I Class t I Help PHYS 2101-002 (Leilabady) Midterm 2 Midterm 2 Begin Date:

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Home I Class t I Help PHYS 2101-002 (Leilabady) Midterm 2 Midterm 2 Begin Date: 10/25/2017 120000 AM-Due Date: 10/25/2017 11:59:00 PM End Date: 10/25/2017 1159.00 PM Problem 1: A block of mass m 89 kg slides along a horizontal surface. The coecent of friction between the block and the surface isPk-0.21. The block has an initial speed of v0 = 16 m/s in the positive x-direction as shown. Otheexpertta.com Part (a) Write an expression for the x-component of the frictional force the block experiences, Fs in terms of the given variables and variables available in the palette. Expression Select from the variables below to write your expression Note that all variables may not be required , , pk, , a, d, g, h, i, j, k m. P. t, vo Part (b) What is the magnitude of the frictional force in N? Numeric A numeric value is expected and not an expression Part (c) How far will the block travel, in meters, before coming to rest? Numeric A numeric value is expected and not an expression

Explanation / Answer

part a:

frictional force=friction coefficient*normal force

=mu_k*m*g

part b:

magnitude of friction force=0.21*89*9.8=183.162 N

part c:

deceleration=friction force/mass=183.162/89=2.058 m/s^2

initial speed=16 m/s

final speed=0 m/s

distance travelled=(final speed^2-initial speed^2)/(2*deceleration)

=(0^2-16^2)/(-2*2.058)

=62.1963 m

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