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Published bySydnie Pan Modified over 2 years ago

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THE ACCELERATION OF AN OBJECT IS DEPENDENT UPON TWO VARIABLES - THE NET FORCE ACTING UPON THE OBJECT AND THE MASS OF THE OBJECT.NET FORCE Newtons Second Law of Motion

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Acceleration, Force, and Mass Newton determined that Acceleration is affected by Force directly and Mass inversely. So….

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Check for Understanding How can both of these objects under free fall conditions accelerate at the same rate? 1.The elephant has more force applied to it. 2.The boy has more force applied to him. 3.The forces on the objects are the same.

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Newtons Third Law of Motion

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If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object For every action there is an equal but opposite reaction

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Action – Reaction Pairs

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Do Action – Reaction Forces Balance? Action – Reaction forces do not balance out because they are acting on 2 different objects – therefore, can cause a change in motion!

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Detecting Motion You cant always detect motion when paired forces are in action. If one of the pairs is much more massive, you will only see the less massive object move Example – When you push down on the Earth, you wont see the Earth move, only you jumping in the air

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Force Unbalanced Objects motion changes in the same direction as the force. Fnet0 a0 Balanced Object remains at rest or uniform motion. Fnet=0 a=0

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Summation Equations Forces are often represented using Free Body Diagrams so we can quickly determine if there is an unbalanced force present.

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Balanced or Unbalanced? Use a summation equation to determine if forces are balanced or unbalanced.

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Check for Understanding Write the summation equation for each of the following. Which has the greatest net force?

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