A force of 15N acts on a 5kg mass, another force of 6N acts in the opposite direction. If mass is initially at rest, find the time rate of change of momentum.
I'm unsure what formula to use. Of course, the prof gives homework questions COMPLETELY different from what we did in class and has us all confused!
THANKS FOR THE HELP!!
2006-10-22 12:08:29 · 2 answers · asked by alonso_fan85 1 in Science & Mathematics ➔ Physics
Start by finding the net force, which is 15N - 6N = 9N. Then find the rate of acceleration. Remember, F = ma, so a = F/m = 9N / 5kg = 1.8 m/s^2. Now, momentum is mass times velocity, and acceleration is the time rate change of velocity, so the time rate change of momentum is just mass times acceleration, which is 5kg * 1.8 m/s^2 = 9N. You may notice that this is the same as the net force. The net force is always the time rate change of momentum, but this is a way to calculate it out if you can't remember that. Honestly, I didn't even remember until I worked it out.
2006-10-22 12:12:05 · answer #1 · answered by DavidK93 7 · 0⤊ 0⤋
F delta T = M delta v.
Delta is basically "change". F=force. T = time, o delta T is change in time, or time interval.
M is mass. V is velocity, so delta v is change in velocity
2006-10-22 19:11:22 · answer #2 · answered by Anonymous · 0⤊ 0⤋