Laboratory exercises to accompany Carhart and Chute's First principles of physics . nd the third cordin the center. See thatall cords are highest reading onany balance should notbe more than 1600 all is adjusted, thereading of each balanceand the position of eachstring on the meter stickshould be recorded (I).One end balance may then be shifted so that it is halfas far from the center as the other. After adjustment,readings should again be taken (II). The total force inone direction may then be compared with the total forcein the other, as indicated in the table for the
Laboratory exercises to accompany Carhart and Chute's First principles of physics . nd the third cordin the center. See thatall cords are highest reading onany balance should notbe more than 1600 all is adjusted, thereading of each balanceand the position of eachstring on the meter stickshould be recorded (I).One end balance may then be shifted so that it is halfas far from the center as the other. After adjustment,readings should again be taken (II). The total force inone direction may then be compared with the total forcein the other, as indicated in the table for the right-handpage. The moment of a force is found by multiplyingthe force by its lever arm. The lever arm is the perpen-dicular distance from the fulcrum about which the force istrying to turn the body, to the force. In this experiment,the distance between each of the outer cords and the centercord will be the lever arm for the force applied by thecord, if the cords are at right angles to the meter moment of each of the end forces around the centercord is to be Fig. 30. THE PRINCIPLE OF MOMENTS 79 Record the readings in tabular form near the top of theleft-hand page. Observations i n Reading of balance A . Reading of balance B .Reading of balance of application of force APoint of application of force BPoint of application of force C . Make a drawing of your apparatus and write a simpledescription of how it was used. Place the table of calcu-lated results at the top of the right-hand page. Calculated Results i ii Combined Force of A and B Force of O Moment of A about C Moment of B about (7. Discussion: Is the moment of A about C clockwise or counter-clockwise ? Is the moment of B about 0 clockwise orcounterclockwise ? Conclusion: Complete the following with a statement about theamount of force in each direction : When three parallel forces act on the same body to pro-duce equilibrium, then Complete the following by comparing with the momentof the third
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysics, bookyear1913
