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P = F delta T!by metalmagik
Tags: delta 
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#1
Jan1206, 07:12 PM

P: 131

okay Im not sure what the right answer is out of these multiple choices because Im not sure how exactly to use F delta T.
A 4.0N force acts for 3.0 sec on an object. The force suddenly increases to 15 N and acts for one more second. What impulse was imparted by these forces to the object? a. 12 Ns b. 15 Ns c. 16 Ns d. 27 Ns I got like...both A and B as possible answers but im not sure which one is right..I used F delta T to get 12 because I just did 4 x 3. Then I got 15 by doing 15 x 1. Im not sure how to use the change in time... when i played around with it i was getting numbers that were not any of the choices. Any help is much appreciated. 


#2
Jan1206, 07:22 PM

HW Helper
P: 2,566

Impulse is additive. That is, if you have an impulse of A over one period of time, and an impulse of B over another period, then the total impulse over both periods is A+B. (taking into account the direction each time)



#3
Jan1206, 07:25 PM

P: 131

Thanks! Let's hope I do good on this retest after I bombed the first momentum test. haha



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