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I suspect that you understand perfectly well that the string tension pulls up on both masses. What you are trying to understand is how the signs are chosen in the equations.Aladin said:Please explain the direction of tension in a string .
Doc Al said:Once you understand the above "acceleration constraint", you can pick a coordinate system and write your equations. For example, choose up to be + and down to be -. Use that convention and try writing the equations for each mass.
Tension in a string is the force applied to the string that causes it to stretch or resist being pulled apart.
The tension in a string is affected by the force applied to it, the length of the string, and the thickness or stiffness of the string.
Tension in a string is measured in units of force, such as pounds or newtons, using a device called a tensiometer or tension gauge.
The tension in a string is directly proportional to the frequency of the sound produced when the string is plucked or struck.
The higher the tension in a string, the faster the speed of the wave traveling through the string. This is due to the increased stiffness of the string at higher tensions.