PHY 121 Lecture Notes - Lecture 3: Net Force, Mattress, Thought Experiment

• School: Miami University
• Department: Physics
• Course: PHY 121
• Professor: Andrew Justin Hachtel

Document Summary

It has been shown that acceleration due to gravity, g, is constantly at work. 3 basic laws that govern the world around us. The book slows down because friction forces are working upon. 1st la(cid:449): (cid:862)a(cid:374) o(cid:271)je(cid:272)t at rest (cid:449)ill sta(cid:455) at rest or a(cid:374) o(cid:271)je(cid:272)t at (cid:373)otio(cid:374) (cid:449)ill sta(cid:455) at (cid:373)otio(cid:374) i(cid:374) a straight li(cid:374)e (cid:449)ith (cid:272)o(cid:374)sta(cid:374)t (cid:448)elo(cid:272)it(cid:455) if a(cid:374)d o(cid:374)l(cid:455) if the (cid:374)et for(cid:272)e a(cid:272)ti(cid:374)g o(cid:374) the o(cid:271)je(cid:272)t is zero(cid:863) Small initial velocity, low force, low mass, softer object to collide with. +colliding with am mattress increases the time of changing velocity, which is essentially decreasing the acceleration as well. That means the impact will be less painful. For(cid:272)e = mass (cid:894)(cid:373)(cid:895) ti(cid:373)es a(cid:272)(cid:272)eleratio(cid:374) (cid:894)a(cid:895) (cid:449)hi(cid:272)h is also k(cid:374)o(cid:449)(cid:374) as ne(cid:449)to(cid:374)"s 2nd law. Work = the net force (n) times the distance (m) +no work is done because a force is being applied but it is not traveling a distance.