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Newton's Laws

What is the first law? An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Newton's Laws. The natural tendency of objects to resist changes in their state of motion.

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Newton's Laws

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  1. What is the first law? An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Newton's Laws

  2. The natural tendency of objects to resist changes in their state of motion. What is inertia?

  3. Do balanced or unbalanced forces affect an object's state of inertia? • Both! • Balanced forces act to keep an object in place so there is no change in motion. For example, the force of gravity pulling down on a book and the force of the table pushing up on a book are equal. These two forces balance each other so the object remains at rest. • Unbalanced forces cause changes in an object’s state of motion (inertia is disrupted). The book is not at equilibrium and so it causes it to change (book goes from resting to moving or from moving to resting).

  4. The second law states that the acceleration of an object is dependent upon two variables (force and mass). Force increases whenever there is an increase in mass and/or acceleration. What is the second law?

  5. What is the formula that originated from the second law? Force = mass x acceleration F = m x a What unit is force measured in? Newtons (N)‏ Newtons are just kg x m/s2

  6. 1.) A 50kg skater pushed by a friend accelerates 5m/s2. How much force did the friend apply? Show all the work and use the correct units!!!

  7. Force = mass x acceleration Force = 50kg x 5m/s2 Force = 250.0kg●m/s2 = 250N

  8. 2.) If a 60kg person on a 15kg sled is pushed with a force of 300 Newtons, what will be the person's acceleration?

  9. Acceleration = force mass Acceleration = 300kgkg●m/s2 75kg Acceleration = 4.0m/s2

  10. 3.) A bowling ball rolled with a force of 15 Newtons accelerates at a rate of 3m/s2. What is the mass of the ball?

  11. Mass = Force Acceleration Mass = 15kg●m/s2 3m/s2 Mass = 5.0kg

  12. What is the third law? For every action there is an equal and opposite reaction. Or in other words, every force must have an equal and opposite force! Thus, all forces come in PAIRS! Newton's 3rd Law

  13. Below the diagram in your notes, explain using Newton's third law why the boy will end up in the water.

  14. As the boy pushes forward to step onto the dock, the boat pushes back and is shifted backwards. Now let's check out how this might work in our own little situation.

  15. 1.) Walking – your foot pushes against the ground and the ground pushes back and you move forward while the Earth moves in the opposite direction. Describe your own examples of Newton's Third Law:

  16. 2.) Trampoline – as you push down on the trampoline, the trampoline pushes back against your feet and is able to launch you in the air.

  17. 3.) Water sprinkler – the water pushes out of the spouts in one direction which forces the arm of the sprinkler to spin in the opposite direction

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