Physics

Problem

An object of mass

3\,\text{kg}

is simultaneously acted upon by three horizontal forces along the same straight line:

F_1 = 8\,\text{N}

to the right,

F_2 = 5\,\text{N}

to the left, and an unknown force

F_3

also to the left. The object is observed to move with a constant velocity. a. (i) Determine the magnitude of

F_3

. b. (ii) Classify the overall set of forces as balanced or unbalanced. c. (iii) If

F_3

suddenly becomes zero while

F_1

and

F_2

remain, calculate the acceleration produced and state its direction.