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Newton’s Second Law and Force Body Diagrams By: Devin Sosnowski, Ryan Kotwica, Craig Reichel, and Jeff Zoellick
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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.
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Concepts 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
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W Fn Fp Ff Fn W
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W A Ft W Ff Fn A
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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.
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Sample Problems 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?
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Quiz Type Questions Accellerations are produced by: A) Masses B) Accelerations C) Velocities D) Forces E) Something else!
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Quiz Type Questions Accellerations are produced by: A) Masses B) Accelerations C) Velocities D) Forces E) Something else!
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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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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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