The discussion revolves around understanding how to determine the appropriate angles for forces in free body diagrams, particularly in the context of physics problems involving objects like boxes and cars. Participants explore the relationships between different forces, such as normal, frictional, and gravitational forces, and their respective directions.
The conversation is active, with participants providing insights and clarifications regarding the angles of forces. Some have shared equations and methods for determining angles, while others express uncertainty and seek further clarification on specific points. There appears to be a collaborative effort to understand the problem better.
Some participants mention specific problems from a textbook, indicating that the discussion is grounded in particular examples. There are references to the need for clarity on notation and the relationships between different angles and forces, suggesting that assumptions about the problem setup are still being examined.
I'm not sure I understand your question. The normal force is always perpendicular to the surface. At the point B, the surface is horizontal (the slope of the tangent is zero) so the normal force acts vertically.
Yep. I was looking at the wrong problem.
I don't understand your notation. What's "á" ?
That's the angle of the tangent to the curve; the perpendicular is π/2 away.
Yep. (OK, not so tricky.)
Here's how I'd find it. First find x & y coordinates of the point A. Then the angle the spring makes with the horizontal is arctan (y/x).
Theta (as defined above) is the angle of the tangent to the curve with respect to the horizontal. So... yes, you are right.
You're not wasting my time. I enjoy it.