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

2. 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!

3. 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!!!)

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

5. 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!

6. 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

7. 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

8. Compare: Mass vs. Weight on different planets:
Person on Earth
is 150 lbs!
Same person on
Jupiter is 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?

9. 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?

10. Class Activity
Gravity and Weight Lab