View Single Post
May24-09, 03:00 AM   #1
 

Understanding derivation of kinetic energy from impulse?


I have a question that annoys my basic understanding of kinetic energy.

I know if I have a force-time plot then the area under the curve is equivalent to the impulse imparted on an object (in units Newton-Seconds). I know that this is also equivalent to the change in momentum of the object i.e. Ft = delta mV

I know that i can get these values from the plot by simply intgrating the Force function wrt to time. Now I want to determine the kinetic energy involved in this event. I know that k.e. = 1/2mV^2 so I know that is simply the integral of the impulse w.r.t. to velocity

Now that is the part conceptually I don't really grasp. What does it really mean to integrate with respect to velocity? This means I am suddenly on a velocity domain, not time, and I don't really understand this?

Thanks.
PhysOrg.com
PhysOrg
physics news on PhysOrg.com

>> A quantum simulator for magnetic materials
>> Atomic-scale investigations solve key puzzle of LED efficiency
>> Error sought & found: State-of-the-art measurement technique optimised