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Understanding Gravity: The Force That Shapes Our Solar System

This lesson delves into the concept of gravity, exploring its definition as an attractive force between masses and how it governs motion in our solar system. It highlights Sir Isaac Newton's groundbreaking work on gravity, the relationship between mass and weight, and the role of inertia in maintaining orbits. Students will learn to model the factors affecting gravity and create vocabulary aids, such as Frayer models, for key terms. This interactive approach encourages a deeper understanding of gravitational forces and their significance in celestial mechanics.

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Understanding Gravity: The Force That Shapes Our Solar System

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Presentation Transcript

  1. Bellringer • What is gravity? How do you know gravity exists?

  2. Answer • Gravity is an attractive force that exists between all objects that have mass. Answers will vary for second question.

  3. Friday March 7, 2014 • Objective: SW understand that gravity is a force that governs the motion of our solar system.

  4. Gravity and Planetary Motion

  5. Isaac Newton • Sir Isaac Newton was one of the greatest scientists and mathematicians that ever lived. • Isaac Newton was the first person to hypothesize that the force that pulls an apple to the ground also pulls the moon toward Earth, keeping it in orbit.

  6. Force • A force is a push or a pull. • Force gives an object the energy to move, stop moving, or change direction. • We would never be able to move without exerting forces on things.

  7. Gravity • Newton was the first person to seriously study gravity • Gravity is a force that attracts all objects toward each other. • The force of gravity is measured in units called Newtons (N).

  8. Gravity • The strength of gravity between two objects depends on two factors: • 1.masses of the objects (If mass increases, force also increases) • 2.distance between the objects (If distance increases, force decreases)

  9. Gravity

  10. Gravity • The greater the mass, the greater the force • The greater the distance, the lessthe force • Acceleration due to gravity = 9.8 m/s2

  11. Mass vs. Weight • Mass- is the amount of matter in an object • Weight- is the force of gravity on an object • The greater the mass the greater the force (weight)

  12. Why do Earth and the moon remain in their orbits? • Inertia and gravity combine to keep Earth in orbit around the sun and the moon in orbit around the Earth. • A combination of gravity and inertia keeps the moon in orbit around the Earth. If there were no gravity, inertia would cause the moon to travel in a straight line. If only gravity existed, the earth would be pulled into the sun.

  13. Graphic Organizer • Model factors that affect the force of gravity. Draw circles to represent masses as described.

  14. Independent Practice • SW create frayer models for the following vocabulary terms: • Gravity- an attractive force that exists between all objects that have mass. • Orbit- the path that a body follows as it travels around another body in space.

  15. Exit Slip • How does gravity affect objects?

  16. Video • http://youtu.be/5S9l_eqjn_U

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