Tension is the force that is transmitted through a string, rope, or cable when it is pulled tight. In the context of two blocks, tension is the force that is exerted on both blocks due to the string connecting them. This force helps keep the blocks together and affects their movement by controlling their acceleration in the direction of the string.
Yes, tension can be greater than the weight of the blocks. This is because tension is dependent on the force applied to the string, not just the weight of the blocks. If an external force is applied to one of the blocks, it can increase the tension in the string and make it greater than the weight of the blocks.
Friction is the force that opposes the motion of objects in contact with each other. In the case of two blocks connected by a string, friction can affect the movement of the blocks by either helping or hindering the tension in the string. For example, if there is a rough surface between the blocks, it can increase the friction and make it harder for the blocks to move, resulting in a decrease in tension.
The tension in the string can change depending on the external forces acting on the blocks. If there is no external force, the tension will be constant. However, if an external force is applied to one of the blocks, the tension will change accordingly. Additionally, friction can also affect the tension in the string and cause it to fluctuate.
The amount of tension in the string can be affected by several factors, including the weight of the blocks, the angle of the string, the presence of friction, and any external forces applied to the blocks. Additionally, the length and strength of the string can also impact the tension. Any changes to these factors can result in a change in the tension of the string.