Phys102 Physics for Life Sciences I Lecture 1

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Presentation transcript:

Phys102 Physics for Life Sciences I Lecture 1 Course Info Instructor: Michael Chen http://www.sfu.ca/~mxchen  Course webpage Office hours (P9442): MWF 11:30am-12:00noon; Fri. 4:00-5:00PM. Tutorials: Mandatory (starting next week May 14-16) Grading Weekly assignments (written + Mastering Physics) : 10% i-cliker quizzes: 5% Tutorial attendance: 5% Midterms: 2 x 20% = 40% Final exam: 40% Note: No make-up midterms. Textbook Giancoli Physics 6th Edition MasteringPhysics Access Code (included in each new book)

Mastering Physics An online personalized assignment system Worth about 5% of your total mark Get your access code If you buy a new text book, the access code is included; If you buy a used book, you would need to buy the access code separately. Register on line: http://www.masteringphysics.com/ Use your SFU computing ID or email address as your login name; Enter your 9-digit SFU ID as your student ID. Our course ID is MPCHEN15176

Registering your i-clicker online 1. Go to www.iclicker.com. 2. Click “REGISTER.” 3. Enter these 4 details and click “submit.” IMPORTANT!! You MUST enter your 9-digit SFU ID in the STUDENT ID field to ensure proper crediting. REGISTER AT www.iclicker.com

i-clicker question 1-1 I have the following version of Giancoli: SFU custom edition 4th Edition (Physics for Scientists and Engineers) 6th Edition (Principles with Applications) Two of above None of above Use the FDOC handout w/ package and leave-behind rebate info. Student FAQS are on the iclicker website

Things to do before next lecture Register to Mastering Physics. Get an i-clicker, and register online. Check the course calendar and read the sections of textbook to be covered (16-1,2,3,4,5,6,8,9). Be ready for clicker quizzes. Attempt assignment #1 (both written and online). Print out and read the lecture notes (P102Lec02.pdf).

Coulomb’s Law The force is along the line connecting the charges, and is attractive if the charges are opposite, and repulsive if they are the same.

Example 16-4: Electric force using vector components. Calculate the net electrostatic force on charge Q3 shown in the figure due to the charges Q1 and Q2. Figure 21-18. Determining the forces for Example 21–3. (a) The directions of the individual forces are as shown because F32 is repulsive (the force on Q3 is in the direction away from Q2 because Q3 and Q2 are both positive) whereas F31 is attractive (Q3 and Q1 have opposite signs), so F31 points toward Q1. (b) Adding F32 to F31 to obtain the net force. Solution: The forces, components, and signs are as shown in the figure. Result: The magnitude of the force is 290 N, at an angle of 65° to the x axis.

Figure 21-18. Determining the forces for Example 21–3 Figure 21-18. Determining the forces for Example 21–3. (a) The directions of the individual forces are as shown because F32 is repulsive (the force on Q3 is in the direction away from Q2 because Q3 and Q2 are both positive) whereas F31 is attractive (Q3 and Q1 have opposite signs), so F31 points toward Q1. (b) Adding F32 to F31 to obtain the net force. Solution: The forces, components, and signs are as shown in the figure. Result: The magnitude of the force is 290 N, at an angle of 65° to the x axis.