Isaac Newton

Isaac Newton (From 4 January 1643 to 31 March 1727) is a famous physicist or mathematician who is studied in senior years of high school. He is well known for his 3 laws of motion and also the discovery of various different formulas relating to force. Newton was born on the same year as Galileo Galilei, another physicist.

Isaac Newton's last name is used as a unit to determine the amount of force which an object exerts.

Isaac's 1st law of motion

An object will always stay in it's current position or in it's constant velocity unless acted upon by an unbalanced force. This means that an object will not change it's state unless if another force is applied. A spacecraft, after leaving the Earth's gravity, will always move in it's constant velocity unless if something else comes near it such as an asteroid, the moon, comets or meteors. The reason we never notice this on the Earth is because everything on the surface of the Earth is being influenced by the Earth's gravity. The force between you and the console or computer reading this article is very negligible compared to the Earth's gravity.

Isaac's 2nd law of motion

An action taken is always inversely proportional to the mass relating to the formula F=(1/m). This is shown when you push a certain trolley. When you push it at a certain strength, the object will travel at x metres. But when you push the trolley from the same position in the same direction except at 3 times the strength of before, you will notice the trolley will travel 3 times the distance (Unless if there is any object or force intercepting the trolley's path). This will imply that the force is always inversely proportional to the mass. Also the formula used to determine the force exerted is F=ma.

Eg. A car with mass 1500KG accelerates at 10ms-1. How much force is it exerting?

Solution: Use formula F=ma
m=1500
a=10
Therefore F=1500x10
=15000N

Newton's Third law of motion

For every action, there is an opposite but equal action. For example when you punch you hand very hard into a brick wall, you will notice that your hand will get hurt. This is because when you punch, you are exerting a force into the wall, but the wall will also exert the force back into your hand. This also explains when one car collides into a stationary car, both cars will get heavily damaged.

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