# Sir Isaac Newton

### Most Influential Scientist of His Time

Newton was born on January 4, 1643 in Woolsthorpe, United Kingdom. He was an English physicist and mathematician. He helped to discover calculus, the mathematics of change, which is vital to our understanding of the world around us. He also developed the laws of universal gravitation, and he invented the first reflecting telescope. But what he was most famous for was The 3 Laws of Motion. He died on March 31, 1727.

## Universal Gravitation

Universal gravitation in a nutshell means that the farther away an object, the lesser the gravitational force. The greater the objects mass, the greater the gravitational force.

## 3 laws of motion

1st law: objects in motion tend to stay in motion while objects in rest tend to stay in rest

2nd law: Force=Mass X Acceleration

3rd law: for every action there is an equal and opposite reaction

## Reflecting telescope

It reflected light from a curved mirror or mirrors to create a bigger picture.

## "Achievements in brief"

• Showed that sunlight is made up of all the colors of the rainbow. He used a glass prism to split a beam of sunlight into its separate colors, then another prism to recombine the rainbow colors to make a beam of white light again.
• He built the first reflecting telescope.
• Wrote the Principia, one of the most important scientific books ever written; in it he used mathematics to explain gravity and motion. (Principia is pronounced with a hard c.)
• He discovered the law of universal gravitation, proving that the force holding the moon in orbit around the earth is the same force that causes an apple to fall from a tree.
• Formulated his three laws of motion – Newton’s Laws – which lie at the heart of the science of movement.
• Showed that the tides are caused by gravitational interactions between the earth, the moon, and the sun.
• Predicted, correctly, that the earth is not perfectly spherical but is squashed into an oblate spheroid, larger around the equator than around the poles.

in formation from http://www.famousscientists.org/isaac-newton/

Newton's 3 Laws, with a bicycle - Joshua Manley

## Sir Isaac Newton and Gravity

Everyone has heard the story about the apple falling on Sir Isaac Newton's head.

I have an activity about gravity and density to share with you guys.

I would like for you to create the Pom-Pom-Drop like the picture in groups.

What happens to objects when we let go of them?

Let's test our Pom-Pom Drop with balls of different sizes and densities.

What will happen when we let go of the heavier, more dense balls?

What will happen when we let of the lighter, less dense balls?