. The Ontario high school physics. ngeffect upon the wheel is the force proportional to the force applied and its distance from the axis of rotation. g^ertcd and alsO to the distance, from the axis, of the point where the force is applied. Let F = the force applied, 2? = the perpendicular distance from the axis to theline AB of the applied force. Then the product Fj:) measures the tendency of tlie wheel toturn, or the tendency to produce angular momentum. This pro-duct is the moment of the force, which is defined as follows: Tlie moment of a force is. the tendency of that force toproduce rotat
. The Ontario high school physics. ngeffect upon the wheel is the force proportional to the force applied and its distance from the axis of rotation. g^ertcd and alsO to the distance, from the axis, of the point where the force is applied. Let F = the force applied, 2? = the perpendicular distance from the axis to theline AB of the applied force. Then the product Fj:) measures the tendency of tlie wheel toturn, or the tendency to produce angular momentum. This pro-duct is the moment of the force, which is defined as follows: Tlie moment of a force is. the tendency of that force toproduce rotation of a body. If the direction of the force F is not perpendicular to theline joining its point of application to the axis, the moment isnot so great, since part of the force is spent uselessly inpressing the wheel against its axis. In Fig. 36, if ^C is tlienew direction of tlie force, then 2^, the new perpendicular, isshorter than p, and hence the product Fj) is smaller. 44 COMPOSITION OF PARALLEL FORCES 45 We can experimentally. 51. Experiment on Law of Moments, test tlie law of moineuls in the followingway. JB is a rod which can move freelyabout a pin driven in a board at 0, andtwo cords attached to the ends A and Jipass over pulleys at the edj;e of theboard. Adjust these until the perpen-dicular distances from 0 upon the sti-ingsare 3 inches and 5 inches. Then if theweight P = 10 oz., the weight Q, to fig. for testing thebalance the other, must = G oz. i!^ °f inoments. Here moment of force 7^ is 10 x .3 = 30,and I! II II (> is 6 X 5 = 30. For equilibrium of the two moments, the products of the forces by the per])endicular distances must be the same, and they must tend to produce rotations in opposite directions. 52. Forces on a Crooked Rod. For a body shuped as in Fig. 38, with forces J and Q acting at theends A and JJ, the moment of I* about0 is Pp, that of Q is Qq; but it is tobe observed that they turn the rod inopposite directions. If we call thefirst
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