Posted by Don on Wednesday, September 28, 2011 at 9:25pm.
A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle è = 40° with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (a) the frictional force on the block from the floor and (b) the block's acceleration.

Physic  Can, Sunday, April 13, 2014 at 3:32am
(a) Friction= u * Normal
Friction= 0.25 * Normal
Normal=15*sin(40) + mg = 43.94
Friction= 0.25 * 43.94 = 10.985N
(b) 19*cos(40)  10.985 = 0.5 N
F =ma
0.5N = 3.5kg * a
a = 0.14 m/s^2

Physic  Rexix Media, Friday, September 25, 2015 at 10:35pm
correction on the above answer. It should say 15*cos(40) for part B.
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