course phy121 ÿy}ͦ̄Eassignment #021
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18:42:50 Explain how to obtain the final speed and direction of motion of a projectile which starts with known velocity in the horizontal direction and falls a known vertical distance, using the analysis of vertical and horizontal motion and vectors.
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RESPONSE --> You determine the `dt of the y-axis then determine the magnitude of the resulting vector of velocity and its angle. mag = aqrt[ x^2 + y^2 ] theta = arctan[y/x]
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18:46:12 Give at least three examples of vector quantities for which we might wish to find the components from magnitude and direction. Explain the meaning of the magnitude and the direction of each, and explain the meaning of the vector components.
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RESPONSE --> Velocity: The magnitude is the ""speed"" of the object throught its final course and the angle is the direction in which it travels. Force: magnitude is the amount of force applied to an object and the angle is the direction in which it is applied. we use this to determine direction and speed of motion. momentum: magnitude is the amount of momentum an object is ""carrying"" when moving and angle again is the direction of motion.
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18:46:23 ** GOOD STUDENT RESPONSE: Examples might include: A force acting on an object causing it to move in an angular direction. A ball falling to the ground with a certain velocity and angle. A two car collision; velocity and momentum are both vector quantities and both important for analyzing the collision.. The magnitude and directiohn of the relsultant is the velocity and direction of travel. The vector components are the horizontal and vertical components that would produce the same effect as the resultant.
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