Does the scale read 100 N 200 N or zero?
Similarly, you may ask, does the scale read 100 N?
Does the scale read zero, 100 N, or 200 N -- or some other reading? The scale reads the tension in the string. The tension in the string is 100 N. This is the force the string must exert up on either of the 100-N weights at either end of the string.
Besides, what will the scale read?
When a person stands on a scale, the reading (the number of pounds or newtons) on the scale is actually the Normal Force that the scale exerts back towards the person to support the person's weight. This will change the contact force (the Normal Force) between the person and the scale.
Explanation: When both teams exert equal force then the net force on the rope will be zero. According to Newton's second law of motion, there will be no acceleration in the rope. But, if one side exerts greater force than other, net force on the rope will not be equal to zero.