8/9/2019 PHYS 1112

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8/9/2019 PHYS 1112

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P1112 Lab Notes Pre-lab 4-2 Cornell University, Spring 2014

Please draw the relevantfree-body diagram, and show your calculation, starting with

= aF

m :

(d) What is the balls acceleration (magnitude and direction) at the instant it comes to rest

momentarily at the topof its motion?

=a

____________________.

3. 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 51 of the balls weight, but always directed

oppositeto the balls velocity through the air.

(a) What force could this be? ____________________.

(b)What is the balls acceleration (magnitude and direction) while it is rising(

) at this speed?=a

____________________.

Please draw the relevantfree-body diagram, and show your calculation, starting with

= aF

m :

(c) What is the balls acceleration (magnitude and direction) whilefalling () at this speed?

=a

____________________.

Please draw the relevantfree-body diagram, and show your calculation, starting with

= aF

m :

4. For the rising and falling objects in questions # 1-3, which kind(s) of force due to the air (constant

upward, always opposite to objects velocity, or none) could make the magnitude of the objects

downward acceleration each value as specified below?(a)At top: g= onaccelerati . ____________________.

(b) At top: g