In this section we'll discuss Newtons laws of motion.
Newtons laws of motion: Newton's law of motion was first stated in his one of the most famous books he published, Philosophiæ Naturalis Principia Mathematica ("Mathematical Principles of Natural Philosophy"). Just for your curiosity, here's the original text of the Newton's law of motion which was written in latin,
Newton's first law states that when an objects is at rest in any given frame it will continue to remain at rest unless acted upon by a force and and objects moving in a straight line at a given velocity continues its motion in a straight lines unless acted upon by the force to change the direction.
Newton's $2^{nd}$ laws of motion: "The alteration of motion is ever proportional to the motive force impress'd; and is made in the direction of the right line in which that force is impress'd."
$$F=ma$$
Newton's second law simply gives us the definition of the quantity called force. As you can see that in the above figure that the amount of acceleration produced is proportional to the mass of an objects for the same amount of the force impressed. Larger ball has the higher mass so the acceleration is lower than that for the ball with lower mass. Important note: "We can thus say that mass is the property of an objects which resists change in motion"
Newton's $3^{rd}$ laws of motion: "To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts."
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courtesy:bbc.co.uk |
EX: A 0.140-kg model rocket accelerates at 45.5 m/s/s on takeoff. Determine the upward force?
Soln: Upward force= weight of the rocket + force on forward motion
=(1.373+6.37)Newton
=7.743N
If you want more information on the Newtons laws of motion, you can also follow this easy to follow notes on Newton's laws of motion.
references:wikipedia, university physics, nelkon and parker.
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