If you are already familiar with basics of circular motion, skip straight to the question. The theoretical background brought below contains clues for the answer.
In physics, circular motion is a movement of an object along the circumference of a circle or rotation along a circular path. Examples of circular motion include: an artificial satellite orbiting the Earth at constant height, a stone which is tied to a rope and is being swung in circles, a car turning through a curve in a race track, an electron moving perpendicular to a uniform magnetic field and many more.
Since the object's velocity vector is constantly changing direction, the moving object is undergoing acceleration by a centripetal force in the direction of the center of rotation. Without this acceleration, the object would move in a straight line, according to Newton's laws of motion. If we take, for example, a marble rotating inside a cone, the forces acting on the marble are shown below:
N- the normal force- is applied by the surface perpendicularly. The horizontal component of the Normal force is the centripetal force, which keeps the marble rotating around the glass circumference.
The subject is presented very clear and precise.
The dual-lingual movies are explaining the material well and coherent.
The qustion itself requires understanding of the phenomenon of the normal force
and the need of upward force vector to make the ball climb up.
Good explinations and overall it is a very impresive work.
Great idea! (הרחבה) I really liked the simple demo for illustration because this is an experiment you can do at home. The idea of video in two languages allows getting more viewers (הצהרה).
Knowing the right answer requires physical knowledge in liquidating vectors and normal power but also those who know, the brief explanation and diagram help to remember (אימות)
Perhaps you can expand the experiment by adding glasses or similar tools in other grades of the glasses. This would give attention to the factor of the glass ramp and sharpen understanding of dependence on surface angles and the significance of the component of normal force causing marble to rise up (הרחבה - הצעתי).