1. Physics 1D03 - Lecture 25 TEST – Thursday at 7pm The test will cover things we have done in class up to Lecture 9 (Chapter 1,2,4,5.1-5.4, 5.6, 6.1-6.3 and 8) Momentum will NOT be on the test Please look over old test (available online) Make sure you’re up on your reading ! Review error calculations (done in lab) Look over CAPA problems (the easier ones!) This test is worth 15% of your mark There are 15 multiple choice questions on the test

2. Physics 1D03 - Lecture 25 TEST Bring: -your student card -your calculator -pen or pencil -please wait for TAs to let you in the room -if you’re not sure about a question – ASK !!! -remain quite near the end – other will still be writing! -do easier questions first, then go back

3. Physics 1D03 - Lecture 25 Kinematics: average velocity, acceleration, vectors, displacement, d=vt+1/2at 2, v=v o +at, v 2 2 =v 1 2 +2ad, projectile motion Dynamics: Free-body diagrams, forces ΣF=ma, friction, ramp and pulleys, vectors

4. Physics 1D03 - Lecture 25 x v a t t t Graphs of x(t), v(t), a(t)

5. Physics 1D03 - Lecture 25 Projectile Motion A plane if flying horizontally at 40m/s when it drops a package. If the package lands 181m ahead of the point above which it was dropped, when was it dropped and from what height ? dvdv dhdh

6. Physics 1D03 - Lecture 25 Friction You are pushing a 100kg fridge over a floor with μ s =0.5 and μ k =0.3 with a force of 290N. What is the magnitude of the frictional force between the fridge and the floor.

7. Physics 1D03 - Lecture 25 Another look at tension Two blocks are being pulled on a frictionless surface by a force F a to the left. The mass of the first block is m and the one behind 5m. What is the tension between the blocks? m 5m FaFa

8. Physics 1D03 - Lecture 25 Contact Force Two blocks, one of mass m1 and the other of mass m2 are being pushed by a force F on a frictionless surface. Determine their acceleration and the magnitude of the contact force. m2m2 m1m1 F

9. Physics 1D03 - Lecture 25 Tension A mass m=20.4kg is suspended by two ropes as show in the diagram below. θ 1 =60 and θ 2 =45. Determine the tension in the strings. θ1θ1 θ2θ2

10. Physics 1D03 - Lecture 25 Inclines Find a. m1m1 m2m2

11. Physics 1D03 - Lecture 25 Pulleys Consider the more elaborate Atwood’s machine shown. a2a2 Assuming the rope and pulleys are ideal, the relation between the accelerations will be: m2m2 m1m1 a1a1

12. Physics 1D03 - Lecture 25 More question to be added later… (I had to go home)