Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
61. Figure 19.—La^ws of oscillation of the pendulum.— Let the pendulum besuspended at A; then,when it is in the positionN it is in equilibrium,as the action of gravity,which acts vertically,is resisted by the ten-sion of the string orrod. If the ball bedraAvn aside to T, andthen allowed to… … 54 MATTER, FORCE, MOTION, AND MECHANICS. T to the dotted line MN. In consequence of its inertia and acquiredvelocity, it will pass on to the position of P. From T to N gravityacts as an accelerating force, but from N to P as a retardingforce. Were it not for the resistance of the air, NP would…
Physics · Astronomy
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