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Gravity- I’m Attracted to You Earth Space. Gravity ► The force of attraction that exists between all matter in the universe.  Key word is matter  Matter.

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Presentation on theme: "Gravity- I’m Attracted to You Earth Space. Gravity ► The force of attraction that exists between all matter in the universe.  Key word is matter  Matter."— Presentation transcript:

1 Gravity- I’m Attracted to You Earth Space

2 Gravity ► The force of attraction that exists between all matter in the universe.  Key word is matter  Matter is the stuff you are and everything else is made of ► It takes a lot of mass for the gravity to be noticeable.  Like planetary mass

3 Law of Gravity ► The force of attraction between any two objects depends on their masses and the distances between them.  The bigger the object, the more gravity it has  The closer an object is to something the stronger the pull.

4 Mass ► Mass is how much matter is in something. ► It is measured using grams and kilograms ► It is NOT the same as weight

5 Distance ► Gravity’s force depends on how close the object is to something. ► As an object gets further away, the force of gravity on that object decreases ► Inverse square law  As the distance increases the gravity decreases exponentially ► Class demonstration

6 Gravitational force = 1 Distance squared G force = 1 d2d2

7 Weight, Mass, and Gravity ► Weight and Mass are not the same thing!!! ► The are related though ► Weight is your mass being pulled down by gravity ► Gravity on earth pulls us down at 9.8 m/s 2

8 Weight, Mass, and Gravity Mass ► How much matter you are made of ► Does not change depending location ► It is the same if you are on earth or in space or on the moon Weight ► The relationship between mass and gravity ► Changes depending on location ► Is different on earth and the moon and space

9 ► In the absence of air resistance, all things will fall toward the earth at the same velocity same velocitysame velocity ► Weight = mass x free-fall acceleration ► w= m g

10 Find Your Mass ► We can find out how much mass we have by using the previous formula ► W = mg ► Weight is in Newtons, so convert your lbs to N.  Multiply lbs times ► Then divide by gravity

11 Gravity on Earth ► Gravity pulls us down toward the center of the earth. ► At different parts of the earth there is more matter between the surface and the center. ► The Poles are flatter and the equator bulges  The bulge means there is more gravity at the equator  People weigh more at the equator than the poles.

12 Gravity & the Moon  Newton observed the Moon’s motion and realized that its direction changes because of the gravitational attraction of Earth  The Moon is constantly falling toward Earth  If no gravity, the Moon would continue to move in a straight line and would not orbit Earth  The same is true of the planets and their moons, stars, and all orbiting bodies throughout the universe.


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