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Goal 4 - Gravity and Newton’s First Law

Learn about gravity and Newton's First Law through the history of gravity, the concept of weight, laws of gravity, and Newton's First Law of Motion. Understand how mass, force, and distance affect gravitational pull and object motion. Practice with examples and explore the significance of inertia in objects.

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Goal 4 - Gravity and Newton’s First Law

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  1. Goal 4 - Gravity and Newton’s First Law Is gravity real - or does the Earth just suck?

  2. THE HISTORY OF GRAVITY Sir Isaac Newton wrote the Law of Gravitation in 1687

  3. Gravity is a force • When gravity pulls something towards the Earth - - we call this force the weight (a measure of gravity).

  4. Law of Gravity Small attractive force Bigger attractive force The size of the force depends on the mass of the objects. The bigger they are, the bigger the force!

  5. Law of Gravity More Less The size of the force also depends on the distance between the objects.

  6. ping pong ball falling The arrow represents the force of gravity

  7. gravity table Normal (upward force) The ball does not fall when your Normal = force of gravity

  8. two objects dropped at the same time

  9. On the Moon – Apollo 15 A heavy geological hammer and a falcon feather were dropped from the same height. They hit the lunar surface at the same time. NASA pictures

  10. Problems Given: Weight= 85 N Gravity = 9.8 N/kg m = 8.67 kg m = 85N/9.8 N/KG You measure a bag of apples as weighing 85 N on a scale. How massive is the bag of apples?

  11. Newton's First law

  12. Newton's First law An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force.

  13. Try this at home!

  14. Unbalanced Can cause an object to start moving, stop moving or changes direction. Result in a net force and cause a change in the object's motion. Balanced Do not change the object's motion. Equal force in opposite directions. Unbalanced vs. balanced force

  15. At rest • Object not moving WILL NOT move unless an unbalanced force acts on it. • Homework will not get done on it's own. • Your room will not be cleaned on it's own.

  16. Object in motion (velocity) will stay in motion. Outside force can change it's speed, velocity, or direction. In Motion

  17. What makes things slow down on their own? Friction Gravity

  18. Inertia Concept of resistance to change in motion. Tendancy of an object to resist that change in motion. Newton's First Law - Law of Intertia

  19. Inertia Depends on Mass Some objects have more Inertia than others. Empty aquarium vs. Full Aquarium The greater the mass of an object, the greater it's Inertia, the greater the force required to change it's motion.

  20. Inertia Depends on Mass

  21. Newton's Law of Inertia

  22. Goal 4 Students will be able to explain Newton's first law.

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