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Tension of rope between 2 blocks

  • Thread starter Notion
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  • #1
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Hey guys I"m new to the forum so I just wanted to say whats up? You'll be seeing me a lot more often btw. :]

Homework Statement


Rachel is pulling 2 blocks across a horizontal friction less surface with an acceleration of 1.5m/s/s. The mass of Block 1 is 4kg and Block 2 is 2kg.

1) What is the tension in the rope between the blocks?
2) What is the tension of the rope being pulled?

Diagram :

ws00w0.png


Homework Equations



F=ma is all I know because I missed the lesson where my teacher went over tension, I missed class due to a religious holiday btw.

The Attempt at a Solution



Well because its a friction-less surface I don't have to worry about that, but all I have to work with is
F=ma
2 masses
Acceleration

So only guess I have is because the blocks are being pulled horizontally the answer to part 1 might be just FofBlock2 - FofBlock1 = T1? (If you look at the diagram it makes more sense!)

For part 2 I have no idea..
 

Answers and Replies

  • #2
Nugatory
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You can use F=ma to calculate the force on the left hand block. Then consider the total force on the right-hand block.
 
  • #3
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What do you mean by consider it?
 
  • #4
haruspex
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What do you mean by consider it?
Write an expression for the net force on the right hand block. What value does it need to have to produce the desired acceleration?
 
  • #5
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We already have acceleration though?

But on the right hand block would FofBlck1= Ftotal - FofBlock2 ?

And how do I find T2?
 
  • #6
SammyS
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We already have acceleration though?

But on the right hand block would FofBlck1= Ftotal - FofBlock2 ?

And how do I find T2?
What do you mean by these quantities: FofBlck1, FofBlock2, Ftotal ?

The tension, T1 in rope 1 is the force acting to the right on block, B1.

The tension, T2 in rope 2 is the force acting to the left on block, B1.

The tension, T2 in rope 2 is also equal the force acting on block, B2, but it acts to the right on B2.

What's the net force on each block?
 

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