What will the FBD of 2 blocks being pulled look like?

In summary: Can you do that?In summary, the blocks are being pulled by a hook at a constant velocity. There is friction between the table and the block.
  • #1
lyn83716
4
0

Homework Statement



Block A is on top of Block B, both are of equal mass and size. Block B is being pulled by a hook at a constant velocity. There is friction between the table and block B.

Homework Equations


[/B]
What will each FBD look like? Is there friction between Block A and Block B?

The Attempt at a Solution



What are the downwards forces acting on the bottom block (B)? Is it gravity as well as the normal force of the top block? Do those two added = the normal force of Block B?

Block A FBD:
-force of gravity of block a (Fga) pointing downwards which equals to the force of normal of block a pointing upwards(Fgn)
-friction between block a and block b? i don't know

Block B FBD:
-force of gravity pointing downwards, force of A on B pointing downwards
-normal force of b pointing upwards
-applied force pointing fwd
-force of kinetic friction pointing backwards
 
Last edited:
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  • #2
lyn83716 said:
What will each FBD look like?
You need to post your own attempt first, as per forum rules.
 
  • #3
Hi lyn83716,

Welcome to Physics Forums.

Your post is all questions but with no attempt at solution(s) or thoughts on what you think will happen. Can you perhaps try to draw what you think the FBDs for the blocks will look like and show us so that helpers can critique the result (tell you where you're right and what might be incorrect)?
 
  • #4
lyn83716 said:

Homework Statement



Block A is on top of Block B, both are of equal mass and size. Block B is being pulled by a hook at a constant velocity. There is friction between the table and block B.

Homework Equations


[/B]
What will each FBD look like? Is there friction between Block A and Block B?

The Attempt at a Solution



What are the downwards forces acting on the bottom block (B)? Is it gravity as well as the normal force of the top block? Do those two added = the normal force of Block B?

Attempt:

Block A FBD:
-force of gravity of block a (Fga) pointing downwards which equals to the force of normal of block a pointing upwards(Fgn)
-friction between block a and block b? i don't know

Block B FBD:
-force of gravity pointing downwards, force of A on B pointing downwards
-normal force of b pointing upwards
-applied force pointing fwd
-force of kinetic friction pointing backwards
 
  • #5
haruspex said:
You need to post your own attempt first, as per forum rules.
I posted my own attempt in the replies
 
  • #6
gneill said:
Hi lyn83716,

Welcome to Physics Forums.

Your post is all questions but with no attempt at solution(s) or thoughts on what you think will happen. Can you perhaps try to draw what you think the FBDs for the blocks will look like and show us so that helpers can critique the result (tell you where you're right and what might be incorrect)?

I posted the attempt in the reply
 
  • #7
lyn83716 said:
-friction between block a and block b? i don't know
Are blocks a and b moving with respect to each other, or is block a moving along with block b? Is the system accelerating?
 
  • #8
lyn83716 said:
Attempt:

Block A FBD:
-force of gravity of block a (Fga) pointing downwards which equals to the force of normal of block a pointing upwards(Fgn)
-friction between block a and block b? i don't know

Block B FBD:
-force of gravity pointing downwards, force of A on B pointing downwards
-normal force of b pointing upwards
-applied force pointing fwd
-force of kinetic friction pointing backwards
Next step is to turn those into equations of the form ΣF=ma.
 

FAQ: What will the FBD of 2 blocks being pulled look like?

What will the FBD of 2 blocks being pulled look like?

The FBD, or free body diagram, of 2 blocks being pulled will typically show two blocks connected by a rope or string, with arrows representing the forces acting on each block.

What forces will be acting on the blocks?

The forces acting on the blocks will depend on the specific scenario. However, common forces may include tension from the rope, the weight of the blocks, and any friction or normal forces from surfaces the blocks are in contact with.

How will the direction of the forces be shown in the FBD?

The direction of the forces will be shown by arrows pointing away from the block for forces acting away from the block, and arrows pointing towards the block for forces acting towards the block.

Will there be any forces acting on the rope or string?

Yes, there will likely be a tension force acting on the rope or string, as it is what is connecting the two blocks and allowing for the pulling force.

What other factors may affect the FBD of 2 blocks being pulled?

Other factors that may affect the FBD could include the mass or weight of the blocks, the surface they are on, and any external forces or constraints that may be present. The FBD will also depend on whether the blocks are being pulled at a constant velocity or undergoing acceleration.

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