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Verification of the Parallelogram of Forces

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-56

2025-11-01

522

 Demonstration. A and B (Fig. 1) are two hooks at the top of a blackboard. To these attach two spring balances, C and D. Hook these to the ends of a cord to which a second cord is tied at H. Suspend a weight W from this cord, and the point H will be kept in equilibrium by the three forces. The resultant of the pulls exerted by the balances C and D may be found as follows. Mark the position of H on the blackboard and the direction of the lines leading to C and D. Take Hc to represent the reading of the balance C, and on the same scale lay off Hd to represent the reading of the balance D. Complete the parallelogram, and Hk, the resultant, will be found to represent an amount equal to W, the equilibrant, and to be vertical.

FIG.1