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InterviewSolution
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Write an explanation on Newton's laws. |
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Answer» Solution :(i) Newton's laws are vector laws. The equation `vecF=mveca` is a vector equation and essentially it is equal to three scalar equations. (ii) The acceleration ALONG the x direction depends only on the component of force acting along the X-direction. (iii) `F_y =ma_z =` The acceleration along the z direction depends only on the component of force acting along the z-direction. (iv) The force acting along y direction cannot ALTER the acceleration along x direction. In the same way, `F_z` cannot affect `a_y`and `a_x` .(v) The acceleration experienced by the body at time t depends on the force which ACTS on the body at that instant of time. It does not depend on the force which acted on the body before the time t. This can be expressed as ` vecF(t) = mveca(t)` (vi) Acceleration of the object does not depend on the previous history of the force. For example, when a spin bowler or a fast bowler THROWS the ball to the batsman, once the ball leaves the hand of the bowler, it experiences only gravitational force and air frictional force. (vii) The acceleration of the ball is independent of how the ball was bowled (with a lower or a higher speed). (viii)In GENERAL, the direction of a force may be different from the direction of motion. . (ix) Though in some cases, the object may move in the same direction as the direction of the force, it is not always true. |
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