You are helping your friend move a new refrigerator into his kitchen. You apply a horizontal force of F = (202i − 161k) N to try and move the 75.0-kg refrigerator. The coefficient of static friction is 0.640.

Question

a) how much static friction force does the floor exert on the fridge (as a vector)?*
b) what is the maximum amount of force needed before the fridge starts to move?

I've considered Newton's third law and I strongly believe the answer is -202i. If this answer is wrong, prove me otherwise.

Answer 1

a. (-202i +161k) Just changed the sign to get the answer.
b. (75x.640x9.8) = 470.4 equal to the maximum static force