Question

A 84.7 kg refrigerator rests on the floor. How much work is required to move it at constant speed for 2.25 m along the floor against a friction force of 193.5 N

Answer 1

Step-by-step explanation:

Formula

F - ff = m * a

W = F * d

Givens

a =0

d = 2.25

m = 84.7

ff = 193.5

Solution

F - ff = ma

F - 193.5 = 0

F = 193.5 N

Notice what this is telling you. The Force applied to the fridge is just enough to overcome friction and not a Newton more

Work = F * d

F = 193.5 N

d = 2.25 Meters

Work = 193.5 * 2.25

Work = 435.4 Joules