Question #05d2d

2 Answers
Apr 20, 2017

Option C. subtracted.

Explanation:

As the two forces are in opposite direction, they will get subtracted.
Forces in the same direction are added.

Apr 20, 2017

See below.

Explanation:

The force resultant #vec R# is the sum of all acting body forces. So #vec R = vec N + vec W#. Forces are vector objects so they add according to the vector addition rules. In the present case, calling #hat i, hat j# the reference unit vectors, we have

#vec N = 0 hat i + N hat j#
#vec W=0 hat i - W hat j#

so

#vec R = 0 hat i +(N-W) hat j#