Week 6 accelerated by like an object of tiny mass, thrust by a great force.Updated October 2nd, 2021
Make certain you read everything on this page and understand completely all the directions. Previous weeks announcements are in the Quarter 1 Archives tab. Week 6 Summary
May the net force be with you!
This week we learned about Newton's second law of motion. Most people are very familiar with the first one (an object in motion, stays in motion...), but not as much with the second law, which is summarized in the equation:
Recollect that because the textbook does not teach you much about analyzing the forces acting on bodies by writing free-body diagrams, we dedicated some time on Tuesday and Thursday doing this. After representing the body as a dot, you draw vector arrows along the x- and y-axes to represent forces acting on the body. For objects that are not experiencing an acceleration, the sum of all those vector arrows should cancel out and equal zero. Students, since we did not have a lot of class time to cover all of the Skill & Practices 3C, 3D and 3F, please make sure you complete these on your own at home. On Tuesday, I would like to start and finish 3G and 3H. What to expect in Week 7
On Tuesday as a class we'll complete the Skill & Practice 3G and 3H. And on Thursday we'll perform a Free Fall lab. You will need to print out the protocol, which is really just Skill & Practice 3I (linked right) and bring to class.
Objects in free fall Before Thursday's class make sure you have watched the Section 3.3 video covering objects in free fall. Free fall occurs whenever an object is under no other forces than that due to gravity. As an example a basketball dropped out of a window is in free fall, as it accelerates at the rate of 9.8 m/ s per second. From the image at the side, we may assume that at two seconds, the velocity of the basketball is 19.6 m/s; at three seconds 29.4 m/s. We can know the velocity (v) of any body in free fall at any point in time (t) using the equation: v = gt, where g is the acceleration due to gravity (9.8 m/ s/ s). Knowing that any object in free fall accelerates towards the Earth at 9.8 m/ s/ s, if an object is dropped off a ledge or out a window, we can calculate the height of that window - or its distance (d) from the ground, using:
During the Thursday laboratory, we will drop a cornhole bag from a second story window (I hope), and determine the height at that point using the above equation, along with the equation for solving for average velocity:
Do make sure you watch the videos as assigned below, and print out Skill & Practice exercises as assigned in the Check-off List of Things to Do. Check-off List of Things to Do:
Please make sure you do the following before classes:
Tues, October 5th:
Upcoming Deadlines (for your situational awareness)
Tues, October 12th:
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Week 7 Resources/ Assets
Hear ye, hear ye, we are now off syllabus! Use this webpage as a guide for upcoming assignments!Chapter 3 Skill & Practice
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