Phys2A_F07_Lecture_13

Phys2A_F07_Lecture_13 - Interacting Objects Newton's 3rd...

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W. P. Beyermann Fall 2007 1 Interacting Objects – Newton’s 3 rd Law • For every force on an object, there is a force on another object that is equal in magnitude and opposite in direction. • How do you identify these paired forces? • Paired forces never act on the same object.
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W. P. Beyermann Fall 2007 2 Newton’s 2 nd law applies separately to each system.
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W. P. Beyermann Fall 2007 3 Newton’s 3 rd Law • Every force occurs as one member of an action/reaction pair of forces. • The two members of an action/reaction pair act on different objects. • The two members of an action/reaction pair are equal in magnitude and opposite in direction. BA AB F F G G = • Notice that force is an interaction between objects. • Even though the forces between two objects are equal, the accelerations may not be. The lighter object will do more of the accelerating.
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W. P. Beyermann Fall 2007 4 Collision Between a Truck and a Car Suppose a large truck and a compact car have a head-on collision. During the collision, the force of the truck on the car is Even though forces are equal, the effects of the forces are more pronounced on the lighter car. a. larger b. smaller c. equal then/to the force of the car on the truck?
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W. P. Beyermann Fall 2007 5 Draw each object separately. Place them in the correct position relative to other objects. Don’t forget to include objects like the earth that may
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This note was uploaded on 04/07/2008 for the course PHY 2A taught by Professor Beyermann during the Fall '08 term at UC Riverside.

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Phys2A_F07_Lecture_13 - Interacting Objects Newton's 3rd...

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