Constants Part A A garage door is mounted on an overhead rail (the figure (Figur

Question

Constants Part A A garage door is mounted on an overhead rail (the figure (Figure 1)). The wheels at A and B have rusted so that they do not roll, but rather slide along the track. The coefficient of kinetic friction is 0.45. The distance between the wheels is 2.00 m, and each is 0.50 m from the vertical sides of the door. The door is uniform and weighs 911 N. It is pushed to the left at constant speed by a horizontal force F. If the distance h is 1.50 m , what is the vertical component of the force exerted on the wheel A by the track? Submit Request Answer Figure 1 of 1 > Part B 2.00 m If the distance h is 1.50 m, what is the vertical component of the force exerted on the wheel B by the track? Submit Request Answer 3.00 m

Explanation / Answer

The frictional force acting is:

Ff = uk N

Ff = 0.45 x 911 = 410 N

considering the net torques

Ff h + Fv d = 911 x 1

410 x 1.5 + Fv 2 = 911

Fv = 148 N

b)In this case

Fv = 911 - 148 = 763 N

Hence, Fv = 763 N

c)set net torque to be zero

Ff hmax = 911

h = 911/410 = 2.22 m

Hence, hmax = 2.22 m

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