In Figure 07.05.03, the diagrams on the left hand side show sphere A, which might be a bowling ball, rolling in a straight line from right to left on a flat, horizontal surface. The plan view presented immediately below, shows that the movement of the sphere is a straight line. However, as shown at the bottom left of the Figure, if the sphere is projected at an angle, into a vertical cylinder, then it follows an upward helical track from E to F in the diagram. The path followed is similar to a screw thread inside a nut or on the outside of a bolt. This same path would be followed if the moving object were a jet of water rather than a solid sphere.
The corresponding three diagrams on the right hand side of Figure 07.05.03 show the situation for the sphere if instead of a vertical cylinder, it is projected into an inverted cone shape. In this instance, the path followed is a spiral curve starting at point K and continuing to point L. When this movement is shown on a flat surface, you will notice that the sphere rolls in a curve towards point D.
This shows clearly that there is an additional sideways force C acting on the sphere, causing this curved path. This has the effect that when the sphere is projected into the cone shape, it exits at point L with a greater upward angle than that with which it enters the cone at point K. This effect is also seen if a jet of water is used rather than a sphere or bowling ball. It should also be realised
that as the sphere runs upwards along the inside surface of the cone, that it's path gets progressively steeper the further it rolls.
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Playing bowling with your friends can help you decide if it is indeed the hobby that you want to invest your time on today. Aside from that, it can help you get a better feel of the sport. More importantly, when you play with your friends, it would become a more fun activity, which you can look forward to each week.