Newton's Laws Of Motion

Newton's Laws Of Motion

Newton's Laws Of Motion

One needs to keep ones foot on the accelerator in order to keep a car moving. Now roll two identical balls, one on smooth surface and the other a rough surface will travel farther than the ball which is rolled on the rough surface. This shows that the motion of the ball is affected by the nature of the surface on which it is rolled.

Furthermore, it may be argued that the rough surface offers a greater stopping force to the ball as compared to the smooth surface and hence the ball comes to rest earlier than the ball set in motion on the smooth surface. Perhaps, it would be natural here to stop and think what will happen if the surface of the ground is made so smooth that it offers no stopping force to ball. The answer would certainly be that the ball should go on moving for ever.

All the above observation about the motion of object can be put in one sentence. This was done by Newton and he stated that.

"Every object continues its state of rest, or of uniform motion in a straight line, unless it is acted upon by an external force".

The above statement is now as the "Newtons first law of motion". From the first law of motion we draw the following two important conclusions: Force is that agent which produces or tends to produce a change in the state of rest or of uniform motion of an object.

All material object posses the property of opposing any change in their state of rest or of uniform motion. This property of matter in known as Inertia. In other words. "Inertia is the tendency of an object to resist a change in its state. Therefore the first law of motion is also called the law of inertia.

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