# HLTH3401 Lecture 7: HLTH3401-Lecture 7

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7 Nov 2018
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## Document Summary

Lecture 7: energetics: collisions, coefficient of restitution, kinetic and potential energy, strain/ elastic energy, work and power. Matter and energy: matter, mass, molecules, atoms, energy (for hlth3401 purposes, property of matter enables movement in space. Types of energy: work (cid:862)(cid:272)osts(cid:863) e(cid:374)erg(cid:455) , potential: (cid:862)pote(cid:374)tial for (cid:373)"v(cid:374)t(cid:863, kinetic: (cid:862)force produci(cid:374)g (cid:373)"v(cid:374)t(cid:863, mechanical: (cid:862)levers, force over a dista(cid:374)ce(cid:863, elastic: (cid:862)storage a(cid:374)d release(cid:863, metabolic: (cid:862)physiological(cid:863) Momentum (m: the quantity of motion of a body, same mass. Li(cid:374)ear (cid:373)o(cid:373)e(cid:374)tu(cid:373) (cid:894)m(cid:895)= (cid:373)ass velo(cid:272)it(cid:455: helmet guy. Momentum (m: principle of conservation of momentum, (cid:862)i(cid:374) the a(cid:271)se(cid:374)(cid:272)e of e(cid:454)ter(cid:374)al for(cid:272)es, the total (cid:373)o(cid:373)e(cid:374)tu(cid:373) of a give(cid:374) s(cid:455)ste(cid:373) re(cid:373)ai(cid:374)s (cid:272)o(cid:374)sta(cid:374)t(cid:863, system momentum = m1 v1 + m2 v2, remains constant pre and post impact. Basketball / golf ball impact experiment: basketball mass, golf ball mass. = ~ 0. 05 kg: what will happen to rebound height of golf ball, draw a kinetic diagram for your explanation.

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