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Force and Newton Law


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Force and Newton Law

  1. 1. FORCE This is HEAVY! I can’t hold it anymore! Can someone help me?
  2. 2. FORCE • push or pull • object’s interaction with its environment • vector quantity • unit is Newton
  3. 3. NET FORCE • the sum of all the forces acting on the object. • a physical quantity that is capable of changing an object’s state of motion 5 N3 N 3 N 5 N Net force = 2N, right Net force = 8N, right
  4. 4. Four Fundamental Forces 1. Gravitational Force – Force of attraction between two masses Position of the stars and planets 2 21 r mm GFg
  5. 5. 2. Electromagnetic Force Force that affects charge particles Your hair will be attracted to a charged balloon The electrons from the clouds will travel towards the land - thunderbolts
  6. 6. 3. Weak Nuclear Force 4. Strong Nuclear Force Four Fundamental Forces Radioactive decay Binds proton in the nucleus
  7. 7. Forces acted on an object 1. Weight - gravitational attraction of an object and the earth - always directed downwards - W = mg weight Normal force 2. Normal Force - support force exerted upon an object - perpendicular to surface
  8. 8. Forces acted on an object 3. Applied force - force applied simply by pushing or pulling weight Normal force Applied force Friction 4. Friction - force exerted by a surface as an object moves across it - parallel to surface and opposite to the direction of motion
  9. 9. Forces acted on an object 5. Tension - force which is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends. T e n s i o n 6. Air resistance - force exerted by the air as an object moves in it - opposite to the direction of motion
  10. 10. Newton’s Law of Motion 1. Law of inertia 2. Law of Acceleration 3. Law of Interaction
  11. 11. I have answer to your inquiry 
  12. 12. Law of Inertia The body at rest tends to remain at rest, and a body in motion continues to move at constant velocity unless acted upon by a net force. Inertia is the property of a body which resists any change in its state of rest or motion. Inertia is proportional to mass.
  13. 13. Importance of using Seatbelts
  14. 14. Importance of Seatbelts Seatbelt exerts force on the person for him not to move forward when it suddenly stops. Force (seatbelt)
  15. 15. Try This at Home Egg Drop Challenge
  16. 16. Law of Acceleration The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.
  17. 17. Law of Acceleration Acceleration is directly proportional to mass Acceleration is directly proportional to mass a F a 1/m a = F/m
  18. 18. Law of Acceleration maFor m F a Force (N) Mass (kg) Acceleration (m/s2 ) Your answer is... 20 ? 2 Try again 15 3 ? Try again ? 0.9 3 Try again 30 ? 0.5 Try again 0.6 0.2 ? Try again ? 20 10 Try again
  19. 19. Law of Interaction For every action, there is an equal and opposite reaction.
  20. 20. Law of Interaction You push the wall by 50 N The wall push you by 50 N in the opposite direction Action Reaction
  21. 21. Law of Interaction Action Reaction You push the ground downward The apple is pulled by the Earth downward The rocket exhausts gas to the ground downward The ground will push you upward The Earth is pulled by the apple upward The gas will push the rocket upward