1. Gravity

2. What is gravity? A force of attraction between objects.
Galileo “discovered” gravity. (Dropping objects from Leaning Tower of Pisa)
The force that pulls objects towards the center of the earth.
Acceleration is 9.8 meters/second2

3. Demo-Holding weights
Why is it hard to hold weights out to your side? Will it get harder the higher from the ground you go? Explain. Why is a heavier weight harder to hold? Would it be easier or harder on Mount Everest? The moon? Is there gravity in space?

5. Gravitational attraction depends on…
The mass of the objects
The distance between objects

7. What is mass? The amount of matter in an object.
Measured in grams or kilograms.
To measure the mass of an object, use a balance.

8. What is the difference between mass and weight?

9. Mass vs. Weight Mass is the amount of matter in something.
Weight is the measure of the pull of gravity.

11. What is work? When a force applied to an object, moves that object.
Work = Force x Distance

12. What is force?
Something that causes a change in the motion of an object.

13. What is a load?
The force exerted on a object.