Construction of a dynamometer
Need: a helical spring, a support of wood, a piece of graph paper, pencil, some bodies sample mass note.
Design: We hung a
'end of the spring support, on which we glued a strip of graph paper vertically.
· Calibration of the instrument :
we have indicated with the pencil in zero reference index of the spring discharge. Our laboratory is equipped with a mass of 0.1 Kg, 0.5 Kg, 1 Kg, we hung on the spring weight and we have drawn a smaller mark on the paper at the index and indicates the value of the force hanging from the spring (assuming g = 9.80 m / s ^ 2, we scored 0,980 N). We have different masses hung by suitable combinations of those available and scoring scala.Il corresponding weights on dynamometer is constructed: we can now proceed to the measure of an unknown weight.
· Measurement of an unknown weight : we hung the body of which we measure the weight and the value we read on the scale at the index, the reading is the weight of the body. In the calibration of the instrument we used the bodies of known mass, then multiplied by the acceleration of gravity to find the weight. For this reason, the reliability of the instrument ceases to be valid if taken to a point on the Earth's surface other than calibration, where g has a slightly different value. Here in the picture the image of a dynamometer.
Need: a helical spring, a support of wood, a piece of graph paper, pencil, some bodies sample mass note.
Design: We hung a
'end of the spring support, on which we glued a strip of graph paper vertically.
· Calibration of the instrument :
we have indicated with the pencil in zero reference index of the spring discharge. Our laboratory is equipped with a mass of 0.1 Kg, 0.5 Kg, 1 Kg, we hung on the spring weight and we have drawn a smaller mark on the paper at the index and indicates the value of the force hanging from the spring (assuming g = 9.80 m / s ^ 2, we scored 0,980 N). We have different masses hung by suitable combinations of those available and scoring scala.Il corresponding weights on dynamometer is constructed: we can now proceed to the measure of an unknown weight.
· Measurement of an unknown weight : we hung the body of which we measure the weight and the value we read on the scale at the index, the reading is the weight of the body. In the calibration of the instrument we used the bodies of known mass, then multiplied by the acceleration of gravity to find the weight. For this reason, the reliability of the instrument ceases to be valid if taken to a point on the Earth's surface other than calibration, where g has a slightly different value. Here in the picture the image of a dynamometer.
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