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Lec9_Review

# Lec9_Review - Today Finish Ch 9(Gravity Review Session for...

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Today: Finish Ch 9 (Gravity) Review Session for Midterm 1

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Review for Midterm 1 Midterm 1 is Tues Oct 6 On Chapters 2 through 9 Bring No. 2 Pencil for Bubble-Sheet 40 multiple-choice questions I will hold extended office hours on morning of Tues Oct 6: email me to set up a time
Recall… Chapter 2: Newton’s 1 st law, inertia, equilibrium (sum of forces = 0) Chapter 3: Linear motion, speed, velocity (= speed with direction), acceleration(= rate of change of velocity), free-fall motion ( a = g) Chapter 4: N’s 2 nd law, Fnet = ma , weight = mg , weight vs mass, friction, non-free fall and air resistance, terminal velocity Chapter 5: N’s 3 rd law, action-reaction, vectors Chapter 6: Momentum(= mv), Impulse= F t = change in momentum, external vs internal forces, momentum conservation when Fnet on system =0, collisions Chapter 7: Energy, Kinetic energy = ½ m v 2 , Potential energy, Grav. PE = mgh , Work = F d , change in KE = Work, Power = Work/time, Total energy conservation, machines Chapter 8: Rotation, linear/tangential speed vs angular/rotational speed, v = r ϖ , rotational inertia I , torque = F x lever arm, angular momentum = I ϖ , ang mom conservation, CM/CG, stability Chapter 9: Gravity: F= Gm 1 m 2 /d 2 , weight = force exerting against supporting surface, tides, black holes Resources for studying: go through questions/exercises/examples we did during the lecture revise “check questions” in book questions in today’s lecture email me if you have any questions or want to meet

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When in a subway car that suddenly stops, you lurch forward. What’s the best explanation for this? A)Because of Newton’s 1 st law – you have inertia. B) Because you have no acceleration C) Because of action-reaction forces between the car and you D) Because of the support force Answer A: Newton’s 1 st law says that objects (you) tend to keep moving in a straight line; inertia resists changes in motion
According to Newton's law of inertia, a rail road train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains A) move too slowly. B) must go up and down hills. C) are much too heavy. D) always have forces that oppose their motion Answer: D How about if there was no friction and no air drag – then what would happen once the engine is turned off? Then the train would be accelerating while the engine was on, and would stop accelerating once the engine is turned off – i.e would move at constant velocity.

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A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is A)equal to the product of its mass times its weight. B) equal to its weight divided by its mass.
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