AP Physics 1: Algebra-Based
2021
AP Physics 1:
Algebra-Based
?
Sample Student Responses
and Scoring Commentary
Inside:
Free Response Question 1
? Scoring Guideline
? Student Samples
? Scoring Commentary
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AP? Physics 1 2021 Scoring Guidelines
Question 1: Short Answer
(a)
7 points
For using conservation of energy to find the speed v of the bicycle as it leaves the ramp
1 point
For using kinematics, vertical components, attempting to find the time the bicycle is in the air
1 point
For a correct expression for X 0 in terms of given quantities
1 point
Example response for part (a)
Etop = Ebottom
m0 gH 0 =
1
2
m0 v 2
v = 2gH 0
v f=
vi y + at
y
?v sin ¦È = v sin ¦È ? gt
?2v sin ¦È =
?gt
2sin ¦È 0 2gH 0 = gt
2sin ¦È 0 2gH 0
g
X 0 = vx t
t =
X 0 = cos ¦È 0 2gH 0
2sin ¦È 0 2gH 0
g
X 0 = 4H 0 cos ¦È 0 sin ¦È 0
Scoring Note:
Using the range equation to get X 0 = 2 H 0 sin 2¦È 0 is sufficient to earn the second and third
points.
Total for part (a)
(b)
3 points
Correct answer: 12 cars
1 point
For an answer and justification that attempts to use the functional dependence of the horizontal
distance on the initial height
For an answer consistent with the expression derived in part (a)
1 point
Total for part (b)
2 points
? 2021 College Board
AP? Physics 1 2021 Scoring Guidelines
(c)
For a linear graph with a constant negative slope
1 point
For a graph that starts at v y and ends at ?v y , using only allowed variables
1 point
Example response for part (c)
Total for part (c)
2 points
Total for Question 1
7 points
? 2021 College Board
P1 Q1 A p1
P1 Q1 A p2
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