歡迎來到Yogi老師解題給你看，今天我要講解的是AP Physics C Mechanics的問題
In the figure below, a small block of mass m = 0.01 kg can slide along the frictionless loop-the-loop. The block is released from rest at point P, at height h = 5.0R above the bottom of the loop. (The height of the loop is R = 28 cm.)
a)What is the magnitude of the horizontal component of the net force acting on the block at point Q?
b)What is the magnitude of the vertical component of the net force acting on the block at point Q
c)At what height h should the block be released from rest so that it is on the verge of losing contact with the track at the top of the loop? (On the verge of losing contact means that the normal force on the block from the track has just then become zero.)