# M5 - Ans2 We know that = v1 v02 2gh Therefore when a ball...

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Name: Sharan Multani Name: Nick Podreborac M5 – Conceptual Questions Q1 .) An object is at rest on a frictionless incline supported by a string parallel to the incline. What is the magnitude of the tension Ft in that string in terms of m (mass of the object) and the incline angle Ө ? Draw all forces and derive the required equation. Ans1.) F=mg Therefore the force on the incline is mgsin(theta) Tension = Force Therefore the tension = mgsin(theta)

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Q2 .) Suppose you are on a rooftop and you throw a ball downward to the ground with an initial speed vo. You then throw an identical ball upward with the same initial speed vo. After rising, this ball also falls to the ground. At the moment each strikes the ground, how do the speeds of the balls compare? Use the concept of the conservation of mechanical energy in your reasoning. Ignore the air resistance.
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Unformatted text preview: Ans2.) We know that, = + v1 v02 2gh Therefore when a ball is dropped with an initial velocity of vo, the final velocity will just increase. If a ball is thrown upwards with an initial velocity it will reach a maximum height where the object will stay steady for a moment. This maximum height attained is: = height v022g Conservation of mechanical energy = KE + PE = KE + PE Where KE= Kinetic Energy PE=Potential Energy So when the ball is thrown with initial velocity, it has slight KE and lots of PE. When a ball is thrown from down with initial velocity it has lots of KE and not much PE. Since they are thrown at same initial velocities but one is against gravity and one is along with gravity. The speeds with which they reach the ground are different....
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M5 - Ans2 We know that = v1 v02 2gh Therefore when a ball...

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