ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: run-bandit on January 17, 2010, 01:24:39 am

Title: elastic collisions
Post by: run-bandit on January 17, 2010, 01:24:39 am: elastic collisions relate to energy and not momentum right?

and you can always use the formula kx=mg when there is a hanging mass in equilibrium?

and we will not need to have a table of values of materials and young's modulus or places (like earth, mercury etc) and their gravitational field strengths on our cheat sheets?
Title: Re: elastic collisions
Post by: superflya on January 17, 2010, 02:12:26 am: elastic collision= momentum + k.e conserved....
Title: Re: elastic collisions
Post by: Akirus on January 17, 2010, 04:15:23 am: Quote from: run-bandit on January 17, 2010, 02:19:36 am
so both criteria have to be met?

Correct.
Title: Re: elastic collisions
Post by: NE2000 on January 18, 2010, 02:40:48 pm: But to prove a collission is elastic in an exam you need not show that momentum is conserved. Energy will do.
Title: Re: elastic collisions
Post by: /0 on January 24, 2010, 05:00:34 am: Yeah you can always use kx = mg is for a hanging mass, as long as it is in equilibrium and there are no other forces (like someone pulling the mass sideways). If it isn't a 'spring' question then use T = mg.
It's basically just an application of $F_{net} = 0$

All the data and equations you need to make calculations will be included in the formula sheet, so you won't need to include them on your cheat sheet. Your cheat sheet should include conceptual things to remember, and perhaps also sample explanations.