An object is free to move on a table, ex-
cept that there is a constant friction force f
that opposes the motion of the object when
it moves. If a force of 10 N pulls the object
across the table, the acceleration is 2 m/s2. If
a force of 20 N pulls the object across the ta-
ble, the acceleration is 6 m/s2. What is the
force of friction f?
a) 3.33 N
b) 1 N
c) 5 N
d) 10 N
e) none of these
F= μS where μ= coefficient of static friction
The Attempt at a Solution
i first find the mass in both case
F= 10 N and a= 2m/s/s
m= F/a = 10/2
F= 20N and a= 6m/s/s
m= F/a = 20/6
what i do next..
either i must go to
F= μ S
please help me to solve it.. how i go further?