Review Sheet _5

Review Sheet _5 - Rev. 1 REVIEW SHEET #5: Impulse, Linear...

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Rev. 1 REVIEW SHEET #5: Impulse, Linear Momentum, Conservation of Linear Momentum; Center of Mass Definitions: In many situations the net force on an object is not constant and acts only during a short time interval. Examples are a ball bouncing off a wall or a baseball bat hitting a ball. For such situations it is useful to define the impulse that the net force ext F r imparts on the body during the time interval from t 1 to t 2 : 2 1 t ext t J F dt = r r (impulse is a vector) Making the simplifying assumption that the net force is constant and setting 2 1 t t t - = ∆ the expression for the impulse becomes ( 29 ext J F t = ⋅∆ r r An object of mass m and velocity v r is defined to have linear momentum p mv = r r (linear momentum is a vector) The Impulse-Linear Momentum Theorem - The change in the linear momentum of an object during a time interval equals the impulse of the net force that acts on the object during that time interval: 2 1 J p p p = ∆ = - r r r r
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This note was uploaded on 09/11/2011 for the course PHYS 0174 taught by Professor Kohler during the Spring '08 term at Pittsburgh.

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Review Sheet _5 - Rev. 1 REVIEW SHEET #5: Impulse, Linear...

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