AP Physics 1 Prep

Answers to AP MC practice question Handout. Section A waves and Sound 1. A 2 A 3 D 4 B 5 C 6 B 7 D 8 A 9 B 10 C 11 BD 12 D 13 B 14 C 22 D 23 B 24 BC 25 A 26 CD 27 C 28 B 23 C 24 A 25 A 26 A 27 B

AP Practice Exam Answers. first draft ( 11AP 1 2 6 16 17 25 26 28 34 38 47 49; Tues am and Thurs lunch material)

1.C 2 A 3 D 4B 5C 6D 7D 8C 9B 10A 11B 12C 13D 14B 15C 16A 17C 18B 19B 20AorB? 21 A 22A 23A 24A 25B 26D 27 (change cm to m) B? 28A 29A 30B 31A 32B 33A 34A 35C 36A 37D 38C 39C 40B 41A 42 change inversely to directly for C, C 43 B 44A 45A 46A +? product instead of Sum then B (or C?)

47AC 48AC 49AC 50AC or AD?

Free response

1. a) around 1.3 s. : Cart slows down 6.0m/s 2.6 m/s

b) final v on x axis, initial v on y axis. find slope M_B= 500(slpe)-500 M_B= (slope-1) 500

c) i) use cons of p. 500v_1i=500v_1f +M_B v_2f v_2f= 500(v_1i+v_1f)/M_B

ii) compare total EK initial and total EK final . 1/m_Avi²= 1/2m_Avf_A²+1/2m_Bvf_B²

2.a) larger reading on Right scale. closer to C of G. therefore need larger force to balance torques. b) L=6N R=9N c)i decrease ii increase d) at far left edge. It would have more counterclockwise torque to balance

3. a) A same w v=wr A is further therefore greater v.

b) A ac = v²/r v and r are both doubled for A

c) 2=4 1=3 5=6 Action=reaction F is inversely proportional to r²

4. A only. EK not conserved. transfers to elastic E (external force from spring) p and Emech also not conserved

Whole System. EK not conserved. converts to E spring Pot. Emech yes conserved. P yes.

5 (gr 11 material) a) I increases : Rnet decreases I=V/Rnet V constant

b) a brighter, greater I P=I²R, 3 dimmer Less I as it is split with 2, 2 turns on

c) P increases: P=VI I increases

d) Charge of system does not change when current flows

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