PHY 2020 Lecture Notes - Lecture 5: Centripetal Force, Centrifugal Force, Universal Law
16 Nov 2017
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If they are at some other angle, it means that the ball will either speed up or slow down: vt (tangential velocity on a circle) = (2)/t. 5. 3: weightlessness is actually an illusion, because you still have mass. If you"re in an elevator and there is a bathroom scale inside (idk why): if stationary, your force on the scale = normal force pushing back on you. This creates high tides and low tides: though the sun has a stronger gravitational pull than the moon does, the moon is much closer, which is why its pull affects us much more than that of the sun. If the sun and moon are in line, on the same side of the earth, they both work together, creating very high tides or very low tides. These are called spring tides (when there is a full moon or new moon). This also happens if the moon and sun are on opposite sides of the earth.
