# Do Now In your notebook, answer the following question in complete sentences: What is the difference between mass and weight?

## Presentation on theme: "Do Now In your notebook, answer the following question in complete sentences: What is the difference between mass and weight?"— Presentation transcript:

Do Now In your notebook, answer the following question in complete sentences: What is the difference between mass and weight?

Mass vs. Weight Mass The amount of matter in an object Weight The force of gravity acting on an object The difference?? GRAVITY

What forces act upon celestial bodies? Gravity

Objectives Define the term gravity. Compare and contrast mass and weight Describe the factors that affect gravity

What is Gravity? Gravity is the attractive force between two objects Gravitys magnitude depends on: Mass of objects involved Distance between objects

Newtons Law of Gravitation F = Gravitational Force G = Universal Gravitation Constant = 6.6726x10 -11 m 3 /(kgs 2 ) m 1 = mass of first object m 2 = mass of second object r = distance between centers of objects

Gravity in Space Body Multiple of Earth gravity m/s 2 Sun27.90274.1 Mercury0.37703.703 Venus0.90328.872 Earth19.8226 Moon0.16551.625 Mars0.38953.728 Jupiter2.64025.93 Saturn1.13911.19 Uranus0.9179.01 Neptune1.14811.28 Pluto0.06210.610