Acceleration of block/pulley system

  • Thread starter genevieveb
  • Start date
  • #1

Homework Statement


What is the acceleration of the 2.0 block in the figure across the frictionless table?
Hint: Think carefully about the acceleration constraint.
I've attached the diagram.

Homework Equations


F=ma


The Attempt at a Solution


A=1.0kg block
B=2.0kg block
For block A: mAa1=2T
0=-Fg+n
For block B: mBa2=T-Fg
and no forces in x direction

So I assume the tension is equal because it is the same string. I also assume that the accelerations are different for the blocks though I'm not completely sure what to assume/why. All I really need is an explanation as to what I should know about the acceleration and why that is.
 

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Answers and Replies

  • #2
PeterO
Homework Helper
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62

Homework Statement


What is the acceleration of the 2.0 block in the figure across the frictionless table?
Hint: Think carefully about the acceleration constraint.
I've attached the diagram.

Homework Equations


F=ma


The Attempt at a Solution


A=1.0kg block
B=2.0kg block
For block A: mAa1=2T
0=-Fg+n
For block B: mBa2=T-Fg
and no forces in x direction

So I assume the tension is equal because it is the same string. I also assume that the accelerations are different for the blocks though I'm not completely sure what to assume/why. All I really need is an explanation as to what I should know about the acceleration and why that is.

That pulley system means that B will move half as much as A. half the distance, half the speed, half the acceleration.
 
  • #3
Oh okay, that makes sense. Thanks a lot!
 

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