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Forces and Newton’s Laws

Forces and Newton’s Laws. Tina R. Walters 2011. Forces. A push or a pull. What is a Net Force?. T he combination of all the forces on an object. Determines the motion of the object . Same Direction Add the forces together Opposite Directions The difference

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Forces and Newton’s Laws

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  1. Forces and Newton’s Laws Tina R. Walters 2011

  2. Forces A push or a pull

  3. What is a Net Force? • The combination of all the forces on an object. • Determines the motion of the object. • Same Direction Add the forces together • Opposite Directions The difference between the 2 forces and in the directions of the larger force.

  4. Forces Balanced • Cancel each other out • No motion • Net force equals zero Unbalanced • Net Force is more than zero • Motion occurs

  5. Newton’s First Law When the net force acting on an object is zero, the object will remain at rest. If the object is already in motion. It will continue to move in a straight line.

  6. Friction • The force that acts to resist sliding between 2 touching surfaces. • Always slows a moving object.

  7. Three types of Friction • Static prevents an object from moving when force is applied.

  8. Three types of Friction • Sliding slows down an object that is sliding Example: Brakes.

  9. Three types of Friction • Rolling Friction Occurs between the ground and part of the tire touching the ground. Pushes bike forward

  10. Newton’s Second Law An object acted on by a force will accelerate in the direction of the force.

  11. Acceleration Acceleration = net force (N) (meters/second) mass (kg)

  12. Acceleration a = Fnet m Forces are measured in newton N = kg-m/s2

  13. Gravity • Pulls objects towards each other • Depends on the mass of an object and the distance between them.

  14. Weight Gravitational forces between you and the Earth.

  15. Weight vs. Mass • A force • Measured in Newtons • Varies with location. • Amount of matter in a object • Measured in Kg. • Stays the same

  16. Air Resistance • Form of friction • Gets larger as an object moves faster • Depends on the shape of an object.

  17. Center of Mass Point in an object that moves as if all the object’s mass were concentrated at that point.

  18. Newton’s Third Law For every action there is an equal but opposite reaction. Action-Reaction Pairs don’t cancel each other

  19. Thrust A force that lifts rockets

  20. Free Fall Only force acting on an object is gravity.

  21. Weightlessness Occurs in a free fall when the weight of an object seems to be zero.

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