IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: yasser37 on May 17, 2010, 08:13:45 pm

Title: Mechanics
Post by: yasser37 on May 17, 2010, 08:13:45 pm

Hi guys

I have 1 problem in Mechanics

The energies.

can someone kindly post all equations used for Energies and Work

such WD = KE + PE + Energy Lost

and so on

thanks

Title: Re: Mechanics
Post by: ifraha18 on May 17, 2010, 08:15:00 pm

work done(driving force)_work done(resistive force)=change in mechnical energy

Title: Re: Mechanics
Post by: [Spy] on May 17, 2010, 08:19:07 pm

YES PLEAAAAAAAAAAAAAAAAASSSSSSSSSSSSSSSSSSSSSSSSSSEEEEEEEEEEEEEEEEEEE

:d

Title: Re: Mechanics
Post by: zxcvbnm on May 17, 2010, 08:25:54 pm

work done by driving force= p.e+k.e+ work done against resistive forces
remember that work done by resistive forces will always be taken positive, while p.e and k.e can also be negative depending on whether they increase or decrease

Title: Re: Mechanics
Post by: ifraha18 on May 17, 2010, 08:29:37 pm

jst rem work by driving force _wrk by resistive force=chnge in mchnical energy

chnge in mchnical is gain in PE - loss in Ke
or viceversa

and power=driving force * velocity
so driving force incase power is given =power/v