Forces hold the universe together

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Presentation transcript:

Forces hold the universe together Gravity Forces hold the universe together

Gravity Holds stars together Holds solar systems together otherwise they would explode into space from the nuclear reactions Holds solar systems together otherwise we would drift off into the frigid emptiness Eureka Episode 6: Gravity http://www.youtube.com/watch?v=fl7TQwPcJyI

Gravitation is a vector quantity pointing towards the Earth’s center. We determined ag = 9.81 m/s2 Thus Fg = ?

In general a gravitational field obeys Newton’s 2nd Law On Earth, acceleration is always 9.8 m/s [ ] So, for an object on Earth the force of gravity acting on an object is

Example Determine for a 3500kg car.

Mass vs. Weight Mass is the quantity of matter in an object. Eureka Episode 7: Weight vs. Mass http://www.youtube.com/watch?v=-F5nmIJOF4U Mass is the quantity of matter in an object. Weight is the force of gravity on an object. Your weight can change (for example if you were on the moon), however your mass will not change … unless you cut your arm off.

Gravity on the Moon On the Moon, the gravitational field strength is only about 1/6 of that on Earth, or about 1.6 N/kg [down]. Calculate the weight of a fully outfitted astronaut on the Moon, if he has a mass of 150 kg.

Weightlessness Why do people in space appear to be floating? Is it because there is no gravity in outer space? In fact, there is lots of gravity in outer space (probably 90% of what it is on Earth). If there were none, astronauts, the space shuttle, the moon and everything else would not stick around at all!!

Quick Lab How Mass and Weight are Related to Earth’s Gravitational Field

Practice 1. Complete the Gravity problems posted on our course site. 2. Complete the following thought experiment at Explorelearning.com (Cosmic baseball)