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Bodies thrown at an Angle

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-46

2025-10-23

761

When a body is thrown at an angle, the velocity with which it is thrown in any direction may be considered a velocity of which the horizontal · and vertical velocities are components. If in Fig. 1 AB represents the velocity with which a ball is thrown, the com- ponents AC and AD will represent the horizontal and vertical velocities respectively. The angle BAC is the angle of elevation, and the distance AE is the range. In the foregoing cases no allowance was made for the resistance of the air, but its effect upon the form of the path in this case is shown in Fig. 1. Its effect is to lessen both velocities (horizontal and vertical) by an amount which is much greater for high velocities than for low ones. Show what its effect would be in cases a and b of this section.

The path ABE is called the trajectory and is similar in shape to that of a batted baseball. The trajectory of a rifle ball is much flatter on account of the high speed of the projectile. One advantage of smokeless over black powder is that it gives a flatter trajectory.