Unformatted text preview: ball. The impulse in this situation is the average force exerted by the bat multiplied by the time the bat and ball were in contact. It is also important to note that impulse is a vector quantity, pointing in the same direction as the force applied. Given the situation of hitting a ball, can we predict the resultant motion of the ball? Let us analyze our equation for impulse more closely, and convert it to a kinematic expression. We first substitute F = ma into our equation: J = FΔt = ( ma ) Δt But the acceleration can also be expressed as a = . Thus: J = m Δt = mΔv = Δ ( mv ) = mv f mv o The large impulse applied by the bat actually reverses the direction of the ball, causing a large change in velocity. Recall that when finding that work caused a change in the quantity mv 2 we defined this as kinetic energy. Similarly, we define momentum according to our equation for an impulse....
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 Fall '10
 DavidJudd
 Physics, Force, Momentum, ΔT

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