Gravity and Elastic Forces

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Presentation transcript:

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

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

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

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)

#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. http://www.youtube.com/watch?v=uhS8K4gFu4s

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

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

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

#7 An object free falls until air resistance and gravity equalize their forces. http://www.youtube.com/watch?v=FHtvDA0W34I 1.5 min https://www.youtube.com/watch?v=OUw3fZwq614 5 min

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

Weight changes! Mass stays the same!

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

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

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