2009_Spring_P1112_Lab_04_Prelab

# 2009_Spring_P1112_Lab_04_Prelab - = a F r r m(c What is the...

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Lab Section: ______ Name: ______________________________ Lab Instructor: ______________________________ Grade: ______ P1112 Lab Notes Pre-lab 4-1 Cornell University, Spring 2009 Lab Unit # 4 Pre-lab Questions: Dynamics of 1-D Motion 1. A ball is dropped from rest in air. In addition to its weight, the ball experiences a constant upward force due to the air equal in magnitude to 5 1 of the ball’s weight. (a) What is the ball’s acceleration (magnitude and direction) while falling ( )? = a r ____________________. Please draw the relevant free-body diagram , and show your calculation, starting with ! = a F r r m : Now the ball is tossed upwards , i.e., given an initial upward velocity. In addition to its weight, the ball still experiences a constant upward force due to the air, equal in magnitude to 5 1 the ball’s weight. (b) What is the ball’s acceleration (magnitude and direction) while it is rising ( )? = a r ____________________. Please draw the relevant free-body diagram , and show your calculation, starting with

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Unformatted text preview: ! = a F r r m : (c) What is the ball’s acceleration (magnitude and direction) at the instant it comes to rest momentarily at the top of its motion? = a r ____________________. P1112 Lab Notes Pre-lab 4-2 Cornell University, Spring 2009 2. Suppose instead that when the ball is moving at a certain speed, it experiences (in addition to its weight) a force due to the air equal in magnitude to 5 1 of the ball’s weight, but always directed opposite to the ball’s velocity through the air. (a) What is the ball’s acceleration (magnitude and direction) while it is rising ( ↑ ) at this speed? = a r ____________________. Please draw the relevant free-body diagram , and show your calculation, starting with ! = a F r r m : (b) What is the ball’s acceleration (magnitude and direction) while falling ( ↓ ) at this speed? = a r ____________________. Please draw the relevant free-body diagram , and show your calculation, starting with ! = a F r r m :...
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2009_Spring_P1112_Lab_04_Prelab - = a F r r m(c What is the...

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