The Difference between Mass & Weight That’s heavy man. Heavy…

What we learned last time: Gravity is dependant upon the mass of two objects and the distance between them. If mass increases – Force of Gravity increases If distance increases – Force of Gravity decreases. Jupiter has more mass than Earth; Therefore it has more gravity The satellite is farther from the center of Earth than we are; Therefore the planet is not pulling as hard on the satellite as the person standing on the surface!

What is Weight? Definition: Weight is a measurement of how strongly gravity pulls on a mass. Weight is completely dependent on the amount of gravity there is. It the result of the force of gravity!!! Without gravity there is NO WEIGHT (the ultimate diet plan!!!)

Amount of Mass & Gravity = Weight If you add more mass – you increase the attractive force between you and the earth Therefore you “weigh” more!

Gravity, Distance and Weight: If I leave the earth and head to outer space, I am farther away from the gravity source. Therefore, you weigh less. Dude! I CAN FLOAT AROUND!

Mass ≠ Weight Mass and Weight are NOT the same thing! Mass: Amount of matter an object contains Has inertia (resistance to a push/pull) Weight (Force): Dependant upon Gravity (mass is not) Attraction between two objects Can change if the objects change distance or mass

Mass and Gravity = Weight Weight really is a measurement of the gravitational attraction between you and the earth. Remember – Weight is a force measurement Mass and Gravity = Weight When gravity pulls on your mass, the resulting force is called “weight”! Source of Gravity Source of Gravity Small mass = less pull = less weight Large mass = more pull = more weight

Compare: Mass vs. Weight on different planets: Person on Earth is 150 lbs! Same person on Jupiter is 354.6 lbs!!! Why is this true? What is different between Jupiter and Earth? Jupiter has more mass than the Earth Therefore it has more gravity! Your same mass would weigh more on Jupiter than on Earth! Q: Did the person’s MASS (amount of matter that makes them up) ever change?

Compare your weight on Earth to what is would be on the Moon: Discuss: Why does your weight change? Discuss: Does your mass change as well?

Class Activity Gravity and Weight Lab