THe Story Of Sir Isaac Newton
Sir Isaac Newton lived a long time ago. He was born in England in 1647 and died in 1727. Sir Isaac Newton was the worst kid in his class, and was picked on by bullies. He decided to fight back by becoming smarter than the bullies. Sir Isaac Newton never married, and never had children.
Sir Isaac Newton is famous for developing the law of gravity and the three laws of motion. One day Sir Isaac Newton was sitting, writting in his journal when suddenly an apple struck him on the head (although, other stories suggest that he simply watched an apple fall to the ground). That was when Sir Isaac Newton became interested in gravity.
Sir Isaac Newton found himself asking questions. For instance, why did the apple fall to the ground? He finally put together in his mind that the same force that made the apple fall was the same force that kept the moon in orbit. This force is called gravity. His investigation into gravity led him to develop the three laws of motion.
Newton's first Law
The first law of motion states that an object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an outside force. For example, a horse that is stopped (an object at rest) will stay stopped unless someone or something tells the horse to walk. On the other hand, a horse that is trotting (an object in motion) will keep trotting unless the rider says WHOA and pulls on the reins to make it stop (an outside force).
Object at rest
Object in motion
Newton's second law
The second law of motion states that force equals mass times acceleration. This means that the power of something (force) depends on how big it is (mass) and by how quickly it changes its speed (acceleration). For example, getting kicked by a big horse (large mass) hurts more than getting kicked by a small pony (small mass), even if they are kicking at the same speed.
Newton's Third Law
The third law of motion states that for every action, there is an equal and opposite reaction. In other words, if something is moved in one direction there is an equal force moving it in the opposite direction. For example, when the horse walks he is pushing his hooves against the ground and the ground is pushing back against his hooves moving his body forward.