Calculate the acceleration of the cyclist

  • Thread starter bonfire89
  • Start date
  • #1
bonfire89
Question....
Hi, I'm a Grade 11 physics student who is having a difficult time on this one question.. Any help would be greatly apretiated.


A cyclist is travelling at 21km/h when she sees a stop sign ahead. She applies the brakes and comes to a stop in 15m. The mass of the cyclist and the bike is 73kg.

a)Calculate the acceleration of the cyclist.
b) Determine the coeficient of friction between the road and the bike.


currently for question a I am atempting to use
v1^2 - v2^2 = 2 * d * a
but I am not getting the right answer


Thanks!
 

Answers and Replies

  • #2
21 km/h =~ 5.838 m/s

a = (0 - 5.838)/900 = -0.0064866666666666666666666666666667m/s^2

ΣF = -μkFN = ma

-μkmg = ma

-μkg = a

μk = -(a/g) = 6.6190476190476190476190476183673e-4


as you can see, mass don't matter.
 
  • #3
bonfire89
awsome! thank you. I am currently doing other porblems, but I shall come back to then, and learn what you did..

THank you!
 

Related Threads on Calculate the acceleration of the cyclist

Replies
10
Views
2K
  • Last Post
Replies
10
Views
602
Replies
1
Views
1K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
3
Views
923
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
2
Views
2K
Replies
2
Views
5K
Top