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Frictionles force problem with hanging mass

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  • #1
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Homework Statement


A block if mass M1=3.70 Kg on a frictionless plane inclined at 30 degrees is connected by a cord over a massless, frictionless pulley to a second block of mass M2= 2.30Kg. What is the magnitude of acceleration of both blocks?


Homework Equations


F=ma


The Attempt at a Solution



4gb9u.png


Fnormal-M1gsin(30)=0
T=M1a
T-M2g=May

Not really sure where to go from here since I have 2 variables T and a.
T-
 

Answers and Replies

  • #2
PhanthomJay
Science Advisor
Homework Helper
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Homework Statement


A block if mass M1=3.70 Kg on a frictionless plane inclined at 30 degrees is connected by a cord over a massless, frictionless pulley to a second block of mass M2= 2.30Kg. What is the magnitude of acceleration of both blocks?


Homework Equations


F=ma


The Attempt at a Solution




Fnormal-M1gsin(30)=0
your geometry/trig is off, it's not the sin function here...
T=M1a
you are missing a force component in this equation
T-M2g=May
..or is it M2g -T = M2ay?? Or does it matter?
Not really sure where to go from here since I have 2 variables T and a.
T-
2 equations, 2 unknowns..are the accelerations of the masses the same?
 
  • #3
rl.bhat
Homework Helper
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Since M2*g > M1*g*sinθ, M2 moves in the downward direction.
Now write down expression for net force on M1 and M2.
 

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