Week 7 (Sep. 23 - 27)

Reading: PSE Chap 5, The laws of motion

Deadline for registration for College Credit: You can. Receive college credit for this course from Wisconsin Lutheran College. Click on the application link below to register for each class you are wishing to apply for college credit. This must be approved by Friday, September 27.

https://admissions.wlc.edu/register/foundations

Once students apply we will wait for Wisconsin Lutheran College to confirm eligibility and requirements for college credit and communicate out further information. Please reach out to Mr. Davis if you have any questions.
Topics: the connection between inertia, force, and acceleration, Newton's Axioms (Newton's 3 laws of motion), types of forces

Quiz on Monday this week.

Week 7 Homework Problems: These will be due, along with next week's homework problems, during week 9.
  1. Sliding puck: A hockey puck slides across the ice at a speed of 10 m/s due east. A hockey player strikes the puck with a force of 30 Newtons for 0.01 seconds. The force is directed due west. What is the final velocity of the puck after the force is done acting? What if the force, instead was directed due north? Solution
  2. Hanging spider: A 1 gram spider is suspended by two threads. One attaches to the wall, the other to the ceiling. If the one attached to the wall is perfectly horizontal, and the one attached to the ceiling makes a 30 degree angle with the ceiling, then what is the tension in each thread? Solution.
  3. Gold ring: Three strings are attached to a small gold ring. One string pulls eastward with a force of 4 lbs. The second string pulls northward with a force of 7 lbs. The third string pulls southwestward with a force of 5 lbs. (a) First, express the net force as a vector with appropriate components (i.e., east, north, west, south). (b) Now: what is the magnitude of the net force on the ring? (c) Finally, what is the angle that the net force makes (compared to the eastward direction) . Solution.


General College Physics