Motion and Forces

Chapter Fourteen: Newton’s Laws of Motion 14.1 Newton’s First and Third Laws 14.2 Newton’s Second Law

5.2 Newton’s Second Law The second law is the connection between force, mass, and motion.

14.2 Three main ideas of the second law Acceleration is the result of unbalanced forces acting on an object. Change in motion. A larger force makes a proportionally larger acceleration. Larger force, faster the acceleration. Acceleration is inversely proportional to mass. More mass less acceleration.

14.2 Acceleration and force The second law says that acceleration is proportional to force. If force is increased or decreased, acceleration will be increased or decreased by the same factor. Double the force-double the acceleration

14.2 Acceleration and force Acceleration is always in the same direction as the net force.

14.2 Acceleration and mass Acceleration is inversely proportional to mass. When the forces stay the same, increasing mass decreases the acceleration.

a = ∆ Y ÷ ∆ X a = Y2- Y1÷ X2 – X1 a = Y2- Y1 X2 – X1 The change in Y over the change is X a = ∆ Y ÷ ∆ X a = Y2- Y1÷ X2 – X1 a = Y2- Y1 X2 – X1

The stronger the force on an object, the greater its acceleration. Force is directly proportional to acceleration. If twice the force is applied, the acceleration is twice as great.

The greater the mass, the smaller the acceleration for a given force. Mass is inversely related to force. An object with twice the mass will have half the acceleration if the same force is applied.

The Elephant and the Feather Free fall With Air Resistance Without Air Resistance A Vacuum http://www.physicsclassroom.com/mmedia/newtlaws/efar.html