ap physics b 2004 scoring...
TRANSCRIPT
AP PHYSICS B2004 SCORING GUIDELINES
Question 115 points total Distribution
of points(a)
i. 1 point
For correctly locating point P at the low point between the hill and the loop 1 point
ii. 3 points
For any indication that energy is conserved 1 point
Setting the kinetic energy at P equal to the potential energy at A:
max1
2 Am mu gy
max 2 Agyu
For correct substitution 1 point2
max 2 9.8 m s 90 mu
For the correct answer 1 point
u (or 42.4 m s using2
10 m sg )
A maximum of 2 points could be earned for applying the kinematics equation
without an explicit statement that since energy is conserved,
anything �falling� from A to P will achieve the same speed as something that is
dropped.
2 2max 2A a yu u D
Copyright © 2004 by College Entrance Examination Board. All rights reserved.
Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for AP students and parents).
3
AP PHYSICS B2004 SCORING GUIDELINES
Question 1 (continued)Distribution
of points
(b) 3 points
For any indication that energy is conserved 1 point
Equating the total energy at point B to the potential energy at point A:
1
2 B B Am mgy mgu y
Solving for the speed at point B:
2B A Bg y yu
For correct substitution 1 point22 9.8 m s 90 m 50 mBu
For the correct answer 1 point
Bu (or 2 using8.3 m s2
10 m sg )
As in (a) ii above, a maximum of 2 points could be earned for using the
kinematics equation.
(c)
i. 3 points
For each correctly drawn and labeled vector 1 pt each
For no extraneous vectors, given that the two vectors above are drawn correctly 1 point
ii. 3 points
For determining the correct value of the weight 1 point2700 kg 9.8 m smg
6860 Nmg (or 7000 N using2
10 m sg )
For indicating there is a centripetal force on the car, either separately or by setting
the sum of the forces equal to the centripetal force
1 point
BmN mg
r
u
22700 kg 28 m s
6860 N20 m
BmN mg
r
u
For the correct answer 1 point
20,580 NN (or 21,000 N using 210 m sg )
Copyright © 2004 by College Entrance Examination Board. All rights reserved.
Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for AP students and parents).
4
AP PHYSICS B2004 SCORING GUIDELINES
Question 1 (continued)Distribution
of points
(d) 2 points
For any clear description of both a modification that will lower the height of
point B and a correct justification
2 points
For example: Flatten out the track on either side of the loop so the bottom of the
loop is on the ground, and thus point B is lower. The work done by friction will
reduce the total mechanical energy available at point B, so if the kinetic energy at
point B is to remain the same, the potential energy at that point must be reduced.
Only one point was awarded for an answer that showed some understanding but was
not totally clear or complete.
Copyright © 2004 by College Entrance Examination Board. All rights reserved.
Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for AP students and parents).
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