QUESTION 2 A5 kg block is released from rest from a height of 5 m and slides down a frictionless incline to P as shown below. It then moves along a frictionless horizontal portion PQ and finally moves up a second rough inclined plane. It comes to a stop 3 m above the horizontal at point R. 2.1 The frictional force, a non-conservative force, between the surface and the block is 18 N. Using ENERGY PRINCIPLES only, calculate the speed of the block at point P. Explain why the kinetic energy at point P is the same as that at point Q. 2.2 2.3 Explain the term non-conservative force. Calculate the angle (titer) of the slope QR.
