Gravity Chapter 12 Section 2 Weight Mass Weight
- Slides: 12
Gravity Chapter 12 Section 2
Weight & Mass • Weight is equal to the force of gravity on an object. • Weight is comparative to mass. • Equation for weight: – W=MG – W = weight – M = mass – G = free-fall acceleration (9. 8 m/s 2 on Earth)
Weight & Mass • Free-fall acceleration is different on other planets! • This is because of the different masses of the planets.
Law of Universal Gravitation • All objects are attracted to one another due to gravity. • This is why objects fall.
Free Fall • Disregarding air resistance, all objects accelerate at the same rate. • Mass doesn’t matter!
Free Fall • On the Apollo 15 mission, astronaut David Scott released a hammer and a feather on the moon at the same moment. What happened?
Free Fall • When air resistance and weight are equal acceleration stops and reaches a maximum velocity called terminal velocity.
Projectile Motion • Projectile Motion has two parts: – Horizontal velocity – Vertical velocity • Forms a curved path
Review • Why would your weight be less on the moon than on Earth even though your mass does not change?
Review • How is weight different than mass?
Review • Why don’t you feel a gravitational force between you and your desk?
Review • What causes a thrown ball to follow a curved path?
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