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Momentum Study Guide Momentum Study Guide

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What equation is used to directly calculate momentum? p = mv

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There are two moving 10 kg objects. Object 1 has velocity of 5m/s Object 2 has velocity of 2.5m/s Which has the greater momentum? Object 1

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http://www.pslc.ws/ma crog/movies/irabs.dcr A roller coaster works by putting in an initial energy to get the cart to the top. When does the cart have the greatest momentum? At the bottom

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I bounce a rubber ball off of the floor and it returns to my hand with the same velocity. How would you describe the magnitude of the ball’s momentum? Stayed the Same

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Watch the following experiment. Teacher stands up from chair Describe the momentum of the chair. P i = 0 P f > 0

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If the time that a force is exerted on an object is large then the momentum will be? Large

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If the force is exerted on an object is small, but is exerted for a long time then the momentum will be? Large

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A ball with a momentum of 6.0 kg·m/s hits a wall and bounces straight back without losing any kinetic energy. What is the change in the ball’s momentum? Δp = p f -p i Δp = -6.0 –(6.0) = -12.0kg*m/s

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A 0.25 kg baseball is pitched with a velocity of 50 m/s and is then batted to the pitcher with a velocity of 70 m/s. What is the magnitude of change in the ball’s momentum? Δp = mΔv Δp = m(v f -v i )

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Momentum The impulse experienced by a body is equivalent to the body’s change in I = Δp

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A player at first base catches a throw traveling 22 m/s. The baseball, which has a mass of 0.21 kg, comes to a complete stop in the glove after 0.15 s. Assuming the force of the glove was uniform, what force did the glove exert on the ball? Ft =mv => F = mv/t I =mv What if it asked for impulse?

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Newton’s Second Law is commonly expressed as F = ma However, Newton originally expressed it as Ft = mv Prove mathematically that both expression are one in the same.

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The End!

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1. Momentum: By Momentum, we mean “Inertia in Motion” or more specifically, the mass of an object multiplied by its velocity. Momentum = mass × velocity.

1. Momentum: By Momentum, we mean “Inertia in Motion” or more specifically, the mass of an object multiplied by its velocity. Momentum = mass × velocity.

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