126 OUTLINES OF NATURAL PHILOSOPHY. 



SECT. VI. 



OF THE DESCENT OF HEAVY BODIES ON PLANE 

 AND CURVE SURFACES. 



197. JL HE force which accelerates the motion 

 of a heavy body on an inclined plane, is to the 

 force of gravity, as the sine of the inclination of 

 the plane to the radius, or as the height of the 

 plane to its length. 



If/*= force accelerating the body on an inclined plane, 

 of which the inclination is i> and if g= force of gra- 

 vity, f=g sin i. Hence the motion of a body on 

 an inclined plane, is a motion uniformly accelerated. 



SXrRAVESANDE, 382. ; MuSCHENBROEK, 608. ; GA- 

 LILEO, Dial. III. Opere, torn. in. p. 106, &c. 



198. If two bodies begin to descend from rest, 

 and from the same point, the one on an inclined 

 plane, and the other falling freely to the ground, 

 their velocities at all equal heights above the sur- 

 face will be equal. 



Hence the velocity acquired by a body in falling 



from rest through a given height, is the same, whe- 



ther 



