An object with a mass of # 25 kg# is lying still on a surface and is compressing a horizontal spring by #5/2 m#. If the spring's constant is # 4 (kg)/s^2#, what is the minimum value of the surface's coefficient of static friction?
2 Answers
Jan 21, 2016
I found
Explanation:
Have a look:
Jan 21, 2016
Explanation:
Take a look at the figure ignore d(t) we will not need it
Now put free body diagram we will have the following equations
#W = N# #F_k =kx = F_f #
Where,
#W = mg#
N = Normal force;
#F_k# = spring force
#F_f# = frictional force
now#F_f = muN#
But#N = mg#
So,#mumg = kx# substitute and get
# mu = (kx)/(mg)#
#mu = 2/49#