• Support PF! Buy your school textbooks, materials and every day products Here!

Help for biomechanics question

  • Thread starter lisafeary
  • Start date
  • #1
2
0
urgent help for biomechanics question

the question that im not sure of is:
A body of mass 9.4 kg initially moving in a straight line at 3.7 m/s is acted on by an accelerating force of 36.5 N (in the same direction as initial motion) for 1.32 seconds Calculate the velocity of the body at the moment the applied force ceases. Express the units in symbol form in the space provided.

when i sorted it out i found acceleration first a=0-3.7/1.32= -2.80
then i had to find final
vf= 3.7+-2.80 x 1.32= my calculator came with 4.e-03 which is 0.004, however i did it another way and made acceleration positive and got 7.40.
but the one thing that im concerned is that i have not inputed the newtons and kilos in this equation :(
your help is greatly appreciated :)
 

Answers and Replies

  • #2
dx
Homework Helper
Gold Member
2,011
18


That's not the acceleration. The acceleration due to a force F is a = F/m.
 
  • #3
2
0


so if i use that formula i did 36.5/9.4= 3.88 then used that to find final
vf= 3.7+ 3.88x1.32= 8.72m/s

it was sorta getting to me because there was a similar question but it did not give us the force in N but it gave the mass, time, final velocity, with that i found acceleration with using vf-vi/time and then times it by the mass. but seeing how you expressed the formula and how i see it varying with the other question makes sence
thanks heaps :)
 

Related Threads for: Help for biomechanics question

  • Last Post
Replies
16
Views
7K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
0
Views
218
Replies
4
Views
4K
  • Last Post
Replies
3
Views
620
Replies
2
Views
859
  • Last Post
Replies
1
Views
4K
  • Last Post
Replies
3
Views
830
Top