- #1
brad sue
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Hello,
I have a problem and I would like to check my answers:
A mass m1 rests on top of another mass m2 , which in turn rests on a frictionless horizontal surface. A light cord is attached to
m2 ,which is used to pull on it witha force F.
a) Find the acceleration ofeach object when the surface between the two objects is frictionless.
I found for m1 : a1 =0 ( since frictionless between the surface of the 2 objects)
For m2 : a2 =F/ m2
b) Find the acceleration of each object when the surface the two objects is rough enough to ensure that m1 does not slide on m2
I found for m1 : a1 = -f1 / m1 where f1 is the friction force due to the contact of the 2 masses.
For m2 = ( f1 + F) / m2
c) What are the magnitude and direction of the contact forces exerced by the lower object on the upper one assuming that the upper object is sliding on the lower object with a non zero coefficient of kinectic μk?
For this question isn't the same as the precedent question. we just replace
f1= μk * N?
Thank you for your time
B
I have a problem and I would like to check my answers:
A mass m1 rests on top of another mass m2 , which in turn rests on a frictionless horizontal surface. A light cord is attached to
m2 ,which is used to pull on it witha force F.
a) Find the acceleration ofeach object when the surface between the two objects is frictionless.
I found for m1 : a1 =0 ( since frictionless between the surface of the 2 objects)
For m2 : a2 =F/ m2
b) Find the acceleration of each object when the surface the two objects is rough enough to ensure that m1 does not slide on m2
I found for m1 : a1 = -f1 / m1 where f1 is the friction force due to the contact of the 2 masses.
For m2 = ( f1 + F) / m2
c) What are the magnitude and direction of the contact forces exerced by the lower object on the upper one assuming that the upper object is sliding on the lower object with a non zero coefficient of kinectic μk?
For this question isn't the same as the precedent question. we just replace
f1= μk * N?
Thank you for your time
B