Big Idea 2 Newtons Law of Gravity Go

Big Idea #2: Newton’s Law of Gravity

Go to your student tracker • Check off SC 4 • Describe the gravitational relationship between the sun and the planets in terms of scale (distance) , proportion (size) and quantity (mass).

What is Gravity? • Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. • Gravity is not just the attraction between objects and the Earth. It is an attraction that exists between all objects, everywhere in the universe.

How does gravity work? • The effect of gravity extends from each object out into space in all directions, and for an infinite distance.

How does Distance affect Gravitational pull? • The strength of the gravitational force reduces quickly with distance. • Humans are never aware of the Sun's gravity pulling them, because the pull is so small because of the great distance between the Earth and Sun. • Yet, it is the Sun's gravity that keeps the Earth in its orbit!

Are there other types of gravitational forces that impact the Earth? • The pull of lunar gravity is unperceivable (not felt) on our bodies, but the Moon's gravity is responsible for the ocean tides on Earth.

Summing it up…. . Write a relationship statement for the gravitational pull and the distance between objects • The greater the distance between two objects the less gravitation pull present. • The less distance between two objects the greater gravitational pull that is exerted.

What other things effect gravitational pull? • Proportion (size) • Quantity (mass)

Summing it up…. . Write a relationship statement for the gravitational pull and the proportion between objects • The bigger object in proportion to a smaller object will exert more gravitational pull. • The smaller the object in proportion to a larger object will exert less gravitational pull.

Summing it up…. . Write a relationship statement for mass and gravitational pull. • The greater the mass of a object the greater the gravitational pull. • The less the mass of an object the less the gravitational pull.

Go to your tracker Success Criteria 4 Can you…. . q. Write a relationship statement for the gravitational pull and the scale/distance between the sun and planets? q. Write a relationship statement for the gravitational pull and the proportion/size between the sun and planets? q. Write a relationship statement for the gravitational pull and the quantity/mass between the sun and planets?