A woman at an airport is towing her 21.0 kg suitcase at constant speed by pulling on the strap at an angle of è above the horizontal (Fig. P4.40). She pulls on the strap with a 34.0 N force, and the friction force on the suitcase is 11.0 N.

Question

(a) What angle does the strap make with the horizontal?
°
(b) What normal force does the ground exert on the suitcase?
N

Answer 1

a. Fh - Ff = ma = 0. Because a = 0.
34*cosA - 11 = 0,
34cosA = 11,
cosA = 0.324,
A = 71 Deg.

b. Fv = mg = 21kg * 9.8N/kg = 206N.