The outlines of physics: an elementary text-book . Fig. 11. THE LAWS OF FALLING BODIES 23 ball will move slowly, but will follow the same laws ofmotion as though it were falling freely-<under the action of£K If the plane becomes horizontal, OU vanishes andthe whole of JSU is consumed in the production of pres-sure. If the plane be very steep, as in Fig. 17, OHapproaches BH in size, and the pressure-producing compo-nent, £0, diminishes. Finally, if the plane be vertical,OH equals BU, pressure against the plane ceases, and theball falls freely under the action of gravitation. 25. Experiment 2
The outlines of physics: an elementary text-book . Fig. 11. THE LAWS OF FALLING BODIES 23 ball will move slowly, but will follow the same laws ofmotion as though it were falling freely-<under the action of£K If the plane becomes horizontal, OU vanishes andthe whole of JSU is consumed in the production of pres-sure. If the plane be very steep, as in Fig. 17, OHapproaches BH in size, and the pressure-producing compo-nent, £0, diminishes. Finally, if the plane be vertical,OH equals BU, pressure against the plane ceases, and theball falls freely under the action of gravitation. 25. Experiment 2. — Determination of the Laws of Motion byMeans of the Inclined Plane. Apparatus ; (1) A smooth wooden plane not less than 4 m. long. (A stoutboard or plank planed on one side will do.) (2) A wooden ball about 10 cm. in diameter, or a smaller ball ofmetal. (3) A metronome set to beat Fig. 18. Procedure : (a) Mount the plane upon two tables as shown in Fig. 18. Itmust be inclined at such an angle that the ball released at a, withoutinitial impetus, will take rather more than three seconds to reach thelower end. Adjust a basket or other receptacle at E to catch the ballat the end of its trip. Provide three uprights or markers, capable ofbeing fastened firmly to the edge of the board at any point, yet easilyshifted. Small joiners clamps (with which every laboratory and 24 THE OUTLINES OF PHYSICS physics class-room should be amply supplied), screwed to the edge ofthe plank, as shown in the diagram, make convenient markers. (J) Set up the metronome in a position where it can convenientlybe started and stopped. (c) Having set the metronome in motion, hold the ball oppositethe line a, near the upper end of the plane. (d) Release the ball with the hand, precisely at the stroke of themetronome, taking care to impart no initial impulse to it. (e) Note the position of the ba
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
