1 / 19

Gravity Notes Part I Take notes on your 6.1

Gravity Notes Part I Take notes on your 6.1. History of Gravity. Greeks believed things had natural places levity = light gravity = heavy Newton 1700’s first to extend the idea of gravity to the whole universe came up with an equation to calculate gravity Einstein 1900’s

colleen-bell
Download Presentation

Gravity Notes Part I Take notes on your 6.1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Gravity Notes Part ITake notes on your 6.1

  2. History of Gravity Greeks • believed things had natural places • levity = light • gravity = heavy Newton 1700’s • first to extend the idea of gravity to the whole universe • came up with an equation to calculate gravity Einstein 1900’s • gravity is the result of the warping of space-time

  3. d m m Universal Law of Gravitation – every particle attracts every other particle constant mass (kg) Force (N) distance (m)

  4. G = 6.67x10-11 Nm2/kg2

  5. Inverse square law – one quantity varies inversely as another quantity is squared

  6. d d m m m 2m Suppose that two masses are a distance apart and are attracted by a force of 20 N. If the mass of one of the objects suddenly doubles, what is the force attracting them?

  7. d 2m 2m 2d m m If the mass of both objects suddenly doubles, what is the force attracting them? If the distance between the object doubles, what is the force?

  8. If the distance between the object doubles, and the mass of one object triples, what is the force? 2d 3m m

  9. Review Projectiles The boy on the tower throws a ball, if there were no gravity it would go straight.

  10. Gravity makes it fall. How far does it fall in 1 second? dy= ½gt2

  11. It will fall 4.9 m vertical in 1 second. However the speed of how fast he throws will determine how far horizontal it goes.

  12. What if the boy throws the ball so fast that you have to take into account the curvature of the earth? Every 8 km or 8000 m the earth drops roughly 4.9 m. How fast would you have to throw a ball so it never hits the ground? 8 km/s or 8000 m/s (18000 mph)

  13. Projectiles A and B fall back to earth. Projectiles C and D achieve an orbit at a fixed height. Projectile E achieves escape velocity. http://www.uwlax.edu/faculty/sallmen/phy155/labs/cannonball_mass_vs_orbit.htm http://www.valdosta.edu/~cbarnbau/astro_demos/frameset_tides.html Click on “Gravity” then “Satellites in Orbit”

  14. Newton, the Apple, and the Falling Moon Newton compared the falling apple with the falling moon. He hypothesized that the moon was a projectile circling the earth because of gravity. The reason it doesn’t fall into the earth is because it has a large linear speed.

  15. Escape Speed – minimum speed an object must have in order to escape from the gravitational pull of a mass. constant mass (kg) velocity (m/s) radius (m)

  16. Reminders • 40s Green Gravity Worksheet due next Monday • You are now able to do the POTW. • If you missed last Thursday and need to make up the Torque Lab, do it by this Thursday. • No school Friday 

More Related