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HW 2 Tips

# HW 2 Tips - HW 2 Tips PHY 131 Sect 10 Fall 2010 Prof...

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1 HW 2 Tips; PHY 131 Sect. 10; Fall 2010 Prof. Pascuzzi Information you may need; m/s 2 “What Graphs Can Tell You” 1) Information from graphs (i.e. slope or derivative, and area, or integration) can easily be found using the pneumonic relationships shown below. Remember that area of a triangle is ½ bh , a rectangle is LW , and there may be times when you have to combine both shapes and find both areas. Also remember that Slope = which has units of the vertical quantity over the horizontal quantity. x (to go from an “ x ” graph to velocity “ v ”, go “ down the slope ” like a skier) v (to go from a “ v ” graph to acceleration “ a ”, go “ down the slope ” like a skier) a x (to go from a “ v ” graph to get distance “ x ”, take “ area ”) v (to go from an “ a ” graph to get velocity “ v ”, take “ area ”) a Problem 2.17 1) Careful. Note that average speed is the total distance covered divided by the total time. 2) Average velocity, on the other hand, is the same formula, but the numerator is now total displacement over time. Remember displacement is your location relative to your fixed starting point, and is a vector.

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2 Problem 2.27
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HW 2 Tips - HW 2 Tips PHY 131 Sect 10 Fall 2010 Prof...

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