College Physics 1: Lecture 21 - Solving Circular Dynamics Problems

In this lecture, we introduce a strategy for solving circular dynamics problems before working out two examples that follow the strategy.
0:00 Problem Solving Strategy
6:46 Example 1
14:34 Example 2
23:45 End of Lecture Questions

[ForexLearnerAI]

To me the last question's answer doesn't make any sense. How come the car is not falling or accelerating downwards if the net force is downwards and nothing is acting against it?!

[roycenhantumbo]

for the last question with the forces pointing in the same direction, is there no static friction keeping the roller coaster on the track?