Posted by justin on Thursday, March 10, 2011 at 12:28am.
A 3.00 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 1.94 m in 1.70 s.
(a) Find the magnitude of the acceleration of the block.
(b) Find the coefficient of kinetic friction between the block and the incline.
(c) Find the magnitude of the frictional force acting on the block.
(d) Find the speed of the block after it has slid a distance 1.94 m.

physics  drwls, Thursday, March 10, 2011 at 1:03am
(a) Solve X = (1/2)a t^2 to get the acceleration, a = 1.34 m/s^2
(b) If there were no friction, the acceleration would be g sin30 = 4.9 m/s^2. There must be an opposing friction force
Ff = M(4.9  1.34)= 10.7 N
(That answers part (c))
The coefficient of kinetic friction is
muk = Ff/M*g*cos30 = 0.364
(d) The final speed of the block (after moving 1.94 m) is twice the average speed. The average speed is
1.94/1.70 = 1.14 m/s
Answer This Question
Related Questions
 Physics  A 2.84 kg block starts from rest at the top of a 30° incline and ...
 Physics  A 2.90 kg block starts from rest at the top of a 30° incline and ...
 Physics  A 2.90 kg block starts from rest at the top of a 30° incline and ...
 Physics  A 2.92 kg block starts from rest at the top of a 30° incline and ...
 Physics  A 2.01 kg block starts from rest at the top of a 25.8degree incline ...
 physics  A 2.67 kg block starts from rest at the top of a 27.6 incline and ...
 Physics  A 2.42kg block starts from rest at the top of a 22.9◦ incline ...
 physics  A 3.00kg block starts from rest at the top of a 30.0 degree incline ...
 physics  A 3.00kg block starts from rest at the top of a 31.0° incline and ...
 Physics  A 3.00kg block starts from rest at the top of a 25.5° incline and ...
More Related Questions