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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 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 Physics 1D03 - Lecture 25 • Kinematics: average velocity, acceleration, vectors, displacement, d=vt+1/2at2, v=vo+at, v22=v12+2ad, projectile motion • Dynamics: Free-body diagrams, forces ΣF=ma, friction, ramp and pulleys, vectors Physics 1D03 - Lecture 25 Graphs of x(t), v(t), a(t) x t v t a t 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 ? dv dh Physics 1D03 - Lecture 25 Friction • You are pushing a 100kg fridge over a floor with μs=0.5 and μk=0.3 with a force of 290N. What is the magnitude of the frictional force between the fridge and the floor. Physics 1D03 - Lecture 25 Another look at tension • Two blocks are being pulled on a frictionless surface by a force Fa to the left. The mass of the first block is m and the one behind 5m. What is the tension between the blocks? Fa 5m m 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. m2 m1 F Physics 1D03 - Lecture 25 Tension • A mass m=20.4kg is suspended by two ropes as show in the diagram below. θ1=60 and θ2=45. Determine the tension in the strings. θ1 θ2 Physics 1D03 - Lecture 25 Inclines • Find a. Physics 1D03 - Lecture 25 Pulleys Consider the more elaborate Atwood’s machine shown. Assuming the rope and pulleys are ideal, the relation between the accelerations will be: a1 a ) a1 a2 b ) a1 2 a2 c ) a1 1 2 m1 a2 m2 a2 a1 d ) The ratio depends on the values of m1 and m2 a2 Physics 1D03 - Lecture 25 More question to be added later… (I had to go home) Physics 1D03 - Lecture 25