Momentum related question

  • Thread starter milkyway11
  • Start date
  • #1
15
0
question states: a 1980 kg car moving at 13 m/s is brought to a stop in 2 seconds when it collides with a wall. if a new model of this car has a longer crumple zone, the passengers experience a 3217.5 N force upon impact. by what percentage has the period of impact been increased? has the impulse on the car and its passengers changed.

my attempt at this problem is to find the new model's acceleration by use F=ma, then use the kinematics Vf=Vo+at to find the period to be 8 sec. Then I can calculate the percentage by dividing the difference with the original period. But this somehow seemed to easy and I am not sure if it's right. Also, I would assume the impulse doesn't change since P=mv, but I am not sure on this.
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
25,832
251
welcome to pf!

hi milkyway11! welcome to pf! :wink:

yes, your method looks fine (and yes, the impulse doesn't change) :smile:
 
  • #3
15
0


Thank you!

hi milkyway11! welcome to pf! :wink:

yes, your method looks fine (and yes, the impulse doesn't change) :smile:
 

Related Threads on Momentum related question

  • Last Post
Replies
4
Views
2K
Replies
2
Views
2K
  • Last Post
Replies
1
Views
4K
Replies
5
Views
5K
Replies
4
Views
695
Replies
1
Views
911
Replies
7
Views
264
Replies
5
Views
2K
  • Last Post
Replies
9
Views
3K
  • Last Post
Replies
2
Views
1K
Top