1. Gravity and Elastic Forces
Forces NTS, Part 2
Gravity and Elastic Forces

2. EQS
What is gravity?
How is weight different from mass?

3. #1
Gravity is a force that pulls objects toward each other.

4. Gravity and Acceleration-#2
Gravity and Acceleration-
At sea level gravity pulls objects towards the center of the Earth at a rate of 9.8 m/s2, (regardless of mass)

5. #3
Gravity keeps the PLANETS in ORBIT around the SUN. It also keeps the MOON in orbit around EARTH.
Gravity makes the planets a spherical shape b/c it is pulling the parts towards the center.

6. #4
The Universal Law of Gravitation states that the force of gravity acts between all objects in the universe.

7. #5 The mass and distance of objects effect gravity. ↑ mass =↑gravity
distance=↓gravity

8. #6
Object falling through the air experience a type of fluid friction called air resistance
Air resistance provides an upward resistance to falling objects

9. #7
An object free falls until air resistance and gravity equalize their forces.
min
5 min

10. Weight = Mass X Acceleration due to gravity#8
Weight = force of gravity plus mass on a person or obj at the surface of a planet
Mass = amount of matter an object contains
Weight = Mass X Acceleration due to gravity
Weight vs. Mass

11. Weight changes!
Mass stays the same!

12. #9
Elasticity is how easily an object returns to its original shape after it is squeezed or stretched.
Ex: rubber band

13. #10 A compression force squeezes or pushes matter together.
Becomes shorter
EX: sitting on a couch

14. #11 Tension stretches or pulls matter. Becomes longer
Ex: fish on a fishing line