Question

Ch 07 HW Exercise 7.9 A small rock with mass 0.14 kg is released from rest at point A, which is at the top edge of a large, (Eigure 1) Assume that the size of the rock is small compared to R, so that the rock can be treated as a particle, and assume that the rock slides rather than rnilo. Tha Winrk done hv frirtinn nn tha rnrk wthon it Figure 1 v of 1

Answer 1

R O 2 mo dusplewnnt AG ahng mg yxo6 ④.as Normal tora,N l's odus cup尸oureno4ceu a to O-55 J Na rngご 0.14x 9.8-11-392-N

D) 1. gravity force is constant in both magnitude = mg and direction = vertically downwards

2. normal force is not constant in either magnitude or direction because normal of surface is changing direction as it moves down so it is not constant

3. as friction = coefficient of friction * normal force, so it is also not constant