Today in Physics we received quite a bit of items in our folders. We got back our Newton’s Laws test, our Lab Report which was turned in on Tuesday, Our Center of Mass Pair Check, and our Center of Mass Reading Question sheet. We did not turn in anything in class today. Today we compared our homework which was questions out of the book with the key while Coats-Haan checked them for completion. After the homework we took notes on Uniform Circular Motion, which dealt with centripetal forces. During these notes Coats-Haan pulled out the Japanese anime doll on a string to illustrate the concepts of today’s lesson. This is the second appearance that the doll has made in Physics this year. We revisited the equation for centripetal acceleration which is a=v2/r. r is the radius and v is the velocity, and a is acceleration. We learned to apply Newton’s Second Law ∑f=ma=mv2/r as centripetal force f is directed radially inward. We then proceeded to complete problems 10 and 11 in the example packet. We then completed a pair check. It was helpful to complete the pair check problems out of order because the second to last problem proved to be the most difficult. Our homework was to complete the centripetal force worksheet, which consists of an explanation of the problems and five problems to be completed.
Work turned in. None (checked Homework)
Work assigned. Centripetal Force Worksheet Due Thursday, Newton’s Laws Applications Test Review due Friday.
QOD. What are some forces that can act as centripetal forces? What is the direction of a centripetal force?
Three forces that can act as centripetal forces are gravity – a satellite orbiting earth, Tension – twirling an object on a string, and Friction – a car travelling on a circular ramp.
The direction of the centripetal force is directed radially inward.
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