Question

While moving out of her dorm room, Bridget carries a 12-kg box to her car,holding it in both arms. a) How much force must be exerted by each of herarms to support the box? b)How will this force change if Bridget holds thebox with only one arm?

Answer 1

weight = mass x gravity

mass = 12 kg

gravity = 9.8 m/s^2

Weight = 12 x 9.8 = 117.6 N

The force (F) needed to support the box:

F = W

FF= = 117.6 N

Divide by 2 arms:

117.6 / 2= 58.8 N

If she holds with one arm

117.6 N

a) 58.8 N

b) 117.6 N