Conceptual problem about two blocks released from a compressed string

In summary, the conversation discusses the net force on blocks A and B connected by a compressed string, with block A having twice the mass of block B. The table is frictionless and the mass of the spring is zero. The opinions are divided between whether the net force on block A and block B will be equal or not. Some suggest that there will be no net force on either block, while others argue that the net force on block A will be larger than that on block B, but not twice as large. Ultimately, the correct answer is that the net force on block A will be equal in magnitude and opposite in direction to the net force on block B, and not zero.
  • #1
KatieLynn
65
0

Homework Statement



Two blocks, A and B, are connected by a compressed string. The mass of bock A is twice that of block B. Immediately after release, compare the net force on block A to the net force on block B. The table is frictionless and the mass of the spring is zero.

1)There is no net force on block A or block B.

2)Fnet of A is equal in magnitude and direction to Fnet B and not zero.

3) Fnet B, will be in the opposite direction and half as large as Fnet A.

4)Fnet A, and Fnet A are both directed toward the left with Fnet A larger than Fnet A, but not twice as large. Block A is pulling block B.

5) Fnet A, will be in the opposite direction and half as large as Fnet B.

6) Fnet A is equal in magnitude and opposite in direction to Fnet B, and not zero.

Homework Equations



I don't think you need any equations.


The Attempt at a Solution



I think it is 5 because A is twice as massive as B so it would take more force to move it the the same and they will be going in opposite directions. Do you agree?
 
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  • #2
I change my mine I think its 6.
 
  • #3


I cannot provide a definitive answer without more information about the specific situation and variables involved. However, based on the given information, option 5 seems to be the most likely scenario. Since block A is twice as massive as block B, it would require twice as much force to move it the same distance. Therefore, the force acting on block A must be larger than the force acting on block B, and they must be in opposite directions due to the compressed string pulling them apart. This means that Fnet A will be in the opposite direction and half as large as Fnet B. It is important to note that without knowing the specifics of the situation, it is impossible to determine the exact values of Fnet A and Fnet B.
 

FAQ: Conceptual problem about two blocks released from a compressed string

How does the compression of the string affect the speed of the blocks?

The compression of the string determines the initial velocity of the blocks when they are released. The more compressed the string is, the higher the initial velocity of the blocks will be.

What factors influence the acceleration of the blocks?

The acceleration of the blocks is influenced by the mass of the blocks and the tension in the string. The heavier the blocks, the slower the acceleration will be. The tension in the string also plays a role, as a higher tension will result in a faster acceleration.

Can the blocks reach the same final velocity if they are released from different compressions of the string?

No, the blocks will not reach the same final velocity if they are released from different compressions of the string. The initial velocity and acceleration will be different, resulting in different final velocities.

How does the angle of release affect the motion of the blocks?

The angle of release will affect the direction of the motion of the blocks. If the blocks are released at a horizontal angle, they will move horizontally. If the blocks are released at an angle, they will move in a curved path.

What is the role of friction in this conceptual problem?

Friction is an external force that acts against the motion of the blocks, slowing them down. However, in this conceptual problem, friction is not taken into consideration and is assumed to be negligible.

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