PHY100H5 Lecture Notes - Lecture 3: Heavy Object, Hockey Puck, Free Fall
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Galileo: the theory of inertia and the theory of falling. Ele(cid:373)e(cid:374)ts(cid:894)(cid:862)earth(cid:863), (cid:862)(cid:449)ater(cid:863), (cid:862)fire(cid:863), a(cid:374)d (cid:862)air(cid:863)(cid:895) seek their (cid:862)(cid:374)atural pla(cid:272)e(cid:863) A rock falling, water flowing, air rising: upward or downward motion. An external force is needed to maintain it: horizontal motions: kick a ball, pull a cart, etc. To move a pile of papers on a desk, you need to apply force. Crystal spheres carrying the sun, moon, planets, and stars move eternally with unchanging circular motion. The spheres are composed of solid ether and no gaps exist between the spheres. Theory states that the same object falls differently depending on its shape (heavier objects will move towards earth faster) A ro(cid:272)k (cid:449)ill fall faster tha(cid:374) a feather (cid:271)e(cid:272)ause it is (cid:373)ade up of (cid:373)ore (cid:862)earth(cid:863), so it (cid:449)ill fall faster. A light and a heavy object fall precisely at the same speed in a vacuum.
