Download Scheme of work for S.S 1
PROJECTILES
THE CONCEPTS OF PROJECTILES Let us consider a boy who releases a piece of stone from his catapult against a bird on a tree branch, the stone will travel in parabolic path towards the bird. Likewise if we throw a tennis ball against a wall, the path of the ball towards the wall is a parabola. On hitting the wall, the ball returns to the ground also along a parabolic path. The same type of curve is seen when a ball is projected horizontally from the top of a building. The stone or ball been projected is known as PROJECTILE . EXAMPLES OF PROJECTILE MOTION (i) A thrown rubber ball re – bouncing from a wall. (ii) An athlete doing the high jump. (iii) A stone released from a catapult. (iv) A bullet fired from a gun. MOTION OF A PROJECTILE Let us consider the simple case of a stone thrown horizontally with an initial velocity of u from the top of a high wall of height h. The stone is subject to two independent motions;
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