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Gravity- I

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Gravity-I m Attracted to You S8P5. Students will recognize characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. – PowerPoint PPT presentation

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Title: Gravity- I


1
Gravity-Im Attracted to You
  • S8P5. Students will recognize characteristics of
    gravity, electricity, and magnetism as major
    kinds of forces acting in nature.
  • a. Recognize that every object exerts
    gravitational force on every other object and
    that the force exerted depends on how much mass
    the objects have and how far apart they are. (DOK
    1)

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
  • Gravitys 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
1
Gravitational force
Distance squared
1
G force
d2
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/s2

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
  • 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 4.448
  • 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 Moons 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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