PHY231 lecture4 - Physic 231 Lecture 4 Main points of...

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Physic 231 Lecture 4 Main points of today’s lecture: Example: addition of velocities Trajectories of objects in 2 imensions: dimensions: 2 downwards m/s 9.8 g = () t v v y y y gt v v yo y y y 0 0 2 1 + = Δ = y g v v gt t v y y y y 2 0 2 2 0 2 2 1 Δ = = Δ t v x v v x x x 0 0 = Δ =
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Concept question If you have a displacement vector whose magnitude is a distance of 4 m and add it to another displacement with magnitude 3 m, it is possible that the total displacement may have a magnitude f 2 m i e be smaller in magnitude than either A or B A B B A C + = of 2 m, i.e. be smaller in magnitude than either A or B. –a ) t r u e – b) false Actually, C can be any number between |=1m to A B |A-B|=1m to A+B=7m B A C + =
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relative velocity problems Label each object by a letter that reminds you of what it is (for example p for paper, g for ground, t for truck). Look for phases such as "the velocity of the paper relative to truck" and write the velocity as: pt truck to relative paper v v = _ _ _ ake the three velocities and assemble them into an equation such as; pt tg pg v v v + = Take the three velocities and assemble them into an equation such as; l f th l it t N t th t th l iti d t b Solve for the velocity you want. Note that these velocities need not be parallel. You may need to solve two equations, one in the x direction and another in the y direction.
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PHY231 lecture4 - Physic 231 Lecture 4 Main points of...

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