What is the tension force in each block on an incline?

[sash187]

Homework Statement

Homework Equations

The Attempt at a Solution

I can write out all the sums in the X and Y direction but don't know what to put for the tension force of each block...i can't assume 1500N for tension in block B correct? because its on an incline and all that. and then how do i do the acceleration of the system? wouldn't i have 2 separate accelerations for each block?

 

[Doc Al]

I can write out all the sums in the X and Y direction but don't know what to put for the tension force of each block...i can't assume 1500N for tension in block B correct? because its on an incline and all that.

You cannot assume any value for the tension. Just call it "T" and include it in your analysis.

and then how do i do the acceleration of the system? wouldn't i have 2 separate accelerations for each block?

The blocks are connected by a rope, so they have the same acceleration.

Applying Newton's 2nd law to each mass separately, you'll end up with two equations and two unknowns. Just right.

 

[sash187]

ahhh then use substitution correct?

for the A block the tension force would be going North East correct? and same with the MA force and (coeff. of friction*N) force since its sliding down?

 

[Doc Al]

ahhh then use substitution correct?

That would work.

for the A block the tension force would be going North East correct? and same with the MA force and (coeff. of friction*N) force since its sliding down?

Both the tension and the friction force on block A act up along the incline (North East, if you like). I don't know what you mean by the 'MA force'. The acceleration is down the incline.

 

[sash187]

mass * acceleration force.

 

[Doc Al]

mass * acceleration force.

That's not a force, that's mass*acceleration. If you were to list the forces acting on either block, you would not include 'mass*acceleration'. That term appears when you apply Newton's 2nd law.