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Newton’s 1 st Law

Newton’s 1 st Law. Newton’s : INERTIA . An object will stay , an object will stay in , an object moving will continue moving , acted upon by an outside net force. If a block that had been sitting on a table moves , look for that caused it to change.

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Newton’s 1 st Law

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  1. Newton’s 1st Law

  2. Newton’s : INERTIA • An object will stay, • an object will stay in , • an object moving will continue moving, • acted upon by an outside net force.

  3. If a block that had been sitting on a table moves, • look for that caused it to change.

  4. If a block that had been traveling in a straight line its direction, • look for that caused it to change.

  5. If a satellite does not travel in the • direction and at speed for all eternity, • look for a net force that.

  6. , if an object is not changing, • there is no force acting on it.

  7. force is not the same as force. • An object have no net force if there are forces acting on it. • An object can have no • force if all of the forces acting on it each other out.

  8. Forces have. • Therefore, force is a quantity. • It has both and • . • What are some other vector quantities? • Name some scalar quantities.

  9. I • won’t change unless it is to change • stubborn • Make me!

  10. and are the same thing.

  11. Mass and inertia are the. • The inertia an object has, the force it will need to change its motion (or motion). • So, force and inertia are proportional.

  12. Inertia and mass are the same thing. • The more mass an object has the it will need to change its motion (or lack of motion). • Force and mass are proportional?

  13. Inertia and mass are both measured in kilograms in the system.

  14. CHECK YOUR UNDERSTANDING • A heavy plate is sitting on top of a table that is covered with a smooth tablecloth. You grab the ends of the tablecloth and pull very quickly. The heavy plate barely moves. Why?

  15. CHECK YOUR UNDERSTANDING • A rocket ship in space fires a probe into empty space where there are no other forces. Will the probe slow down? Will the probe speed up? Will the probe change direction? • Why?

  16. CHECK YOUR UNDERSTANDING • A girl is skateboarding but she has to keep pushing on the ground in order to keep moving at the same speed. Why? • . • .

  17. is a force. • Friction always acts to the direction that the object is moving (or wants to move). • Friction always works to an object down. • What would happen if the force of friction could speed an object up? • NO MORE ENERGY CRISIS!

  18. Friction is an force. • (Just thought you wanted to know that.)

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