The protractor also has a limited precision, so there is always some uncertainty

Question

The protractor also has a limited precision, so there is always some uncertainty in the angle readings. This uncertainty will also propagate through the calculation of the weight, just like the uncertainty in the force readings does. The relationship between weight and the angles is not linear, though, so the propagation is not as straightforward.The easiest way to proceed is by looking at the highest and lowest values of the calculated quantity. Example: In a given experiment, a force is measured to be (483

Explanation / Answer

F=821N
angle=(45,60)
one is increasing while other is decreasing
let max at=(45+60)/2=52.50

F=(821+-3(52.5-45))=[821+22.5]N

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