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Newton’s Second Law and Force Body Diagrams

Newton’s Second Law and Force Body Diagrams . By: Devin Sosnowski, Ryan Kotwica, Craig Reichel, and Jeff Zoellick. Terms. net force – the vector sum of all the forces acting on the body weight – caused by mass accelerating downwards due to gravity

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Newton’s Second Law and Force Body Diagrams

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  1. Newton’s Second Law and Force Body Diagrams By: Devin Sosnowski, Ryan Kotwica, Craig Reichel, and Jeff Zoellick

  2. Terms • net force – the vector sum of all the forces acting on the body • weight – caused by mass accelerating downwards due to gravity • force body diagram – a diagram showing the directions or forces acting on an object.

  3. Newton’s Second Law of Motion states the acceleration of a body is directly proportional to the force on it and inversely proportional to its mass This law may be summarized by the equation: a=F/m or more commonly known as… F=ma Concepts

  4. Force Body Diagrams Fn Fn Ff Fp W W

  5. More diagrams Fn Ff A Ft W A W

  6. Examples from the Real World • When you step on the accelerator in a car, you go forward. • When the brakes are applied on a roller coaster, the train of cars slows down and comes to a stop. • A bowling ball will accelerate (roll) faster with more force, but a bowling ball will roll slower than a basketball with the same amount of force because its less massive.

  7. Draw the force diagrams for an object deccelerating due to friction Draw an object in free fall Draw an object that’s sliding on an angle with friction A 5kg bowling ball is accelerating down the lane at 2m/s/s. What is the Net Force? A 2000 kg pickup truck moves at constant speed of 50 m/s down the street. What is its Net Force? Sample Problems

  8. Quiz Type Questions • Accellerations are produced by: • A) Masses • B) Accelerations • C) Velocities • D) Forces • E) Something else!

  9. Quiz Type Questions • Accellerations are produced by: • A) Masses • B) Accelerations • C) Velocities • D) Forces • E) Something else!

  10. Quiz Type Questions • An object following a straight line path at constant speed _______. • A) must be moving in a vacuum. • B) has no forces acting on it. • C) has a net force acting on it in the direction of motion. • D) has zero acceleration. • E) none of the above.

  11. Quiz Type Questions • An object following a straight line path at constant speed _______. • A) must be moving in a vacuum. • B) has no forces acting on it. • C) has a net force acting on it in the direction of motion. • D) has zero acceleration. • E) none of the above.

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