Academic Year 2022-2023 –Term3
Subject: Physics G 11 -V2
Date: 12-June-2023
Time: 9:00-11:00
Name: ………………………
No. of Pages: ___8____
Section:
Grade and Section:
…………………………….
Standards
Depth of
Knowledge
Questions
HS-PS2-4/HS-ESS1-4
DOK 1 Knowledge
(30%)
DOK2
Applying (50%)
DOK3
Analysis (20%)
HS-PS2-4/HS-ESS1-4
1-5-7-8-9-1620
2-3-4-6-10-11-1213-14-15-19-23
HS-PS2-4/HS-ESS1-4
17-18-21-22
Total Mark
(Percentage out
of 100)
Check by
(Signature)
Reviewed by
(Signature)
Subject Lead
Name and
Signature
Overall
Mark
(%)
Outstanding
Very Good
Good
Acceptable
Weak
Very Weak
100-96%
95-85%
84-75%
74-60%
59-50%
Below 50%
/ 50
Exceeds
Standards
Exceeds /
Meets
Standards
Meets
Standards
Meets /
Approaches
Standards
Approaches
Standards
Developing
Standards
/ 100
Elite Private School
Cover Page
2022-2023
Part1: For each of the following questions / statements
choose the correct option
DOK1
1) An object, shown in the accompanying figure, moves in
uniform circular motion. Which arrow best depicts the
net force acting on the object at the instant shown?
DOK2
2) Two bowling balls each have a mass of (m =410 g). The centers of the
bowling balls are located at r =41.5 × 10 -2 m apart use G = 6.67× 10-11
N.m2/kg2. What gravitational force do the two bowling balls exert on each
other? (𝑭 =
(A)
(B)
(C)
(D)
𝑮 𝒎𝟐
𝒓𝟐
)
6.5 × 10 -11 N
8.6 × 10 -11 N
5.6 × 10 -11 N
3.5 × 10 -11N
DOK2
3) What is the orbital speed of Earth’s moon? The average distance between
the centers of Earth and of the moon is r = 3.84x108 m
and the mass of Earth m = 5.97 × 1024 kg.
Use G = 6.67× 10-11 N.m2/kg2
(A)
(B)
(C)
(D)
1020 m/s
1700 m/s
2700 m/s
1107 m/s
DOK2
4) A ball rotates at a constant speed of (v= 3 m/s) on the end of (r=1.2 m)
long string. The string describes a horizontal circle. What is the centripetal
acceleration of the object? ( 𝑎 =
𝑣2
𝑟
)
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DOK1
5) A racing car travels on a circular track of radius r= 200 m. Suppose the car
moves with a constant linear speed of v= 48.8 m/s.
(A)
(B)
(C)
(D)
𝒗
(𝝎 = 𝒓)
0.24 rad/s
5.2 rad/s
19.6 rad/s
0.36 rad/s
DOK2
6) A potter’s wheel moves uniformly from rest ωi = 0 to an angular speed of ωf
= 0.20 rev/s in t =44 s. ( 𝛼 =
(A)
(B)
(C)
(D)
𝜔𝑓− 𝜔𝑖
𝑡
)
Hint : convert ω to rad/s
0.028 rad/s2
0.048 rad/s2
0.206 rad/s2
0.058 rad/s2
DOK1
7) Which is defined as
(A)
(B)
(C)
(D)
1
2π
of a revolution?
Degree
Radian
Angular Velocity
Angular acceleration
DOK1
8) Which is the change in the angular velocity as an object rotates?
(A) Displacement
(B) Angular Displacement
(C) Angular Velocity
(D) Angular Acceleration
DOK1
9) Which is the number of complete revolutions made by an object in 1 s?
(A) Angular Acceleration
(B) Angular Velocity
(C) Angular Displacement
(D) Angular frequency
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DOK2
10) The momentum of a m= 4000 kg truck is p= 6.35 × 104 kg·m/s. At what
𝑝
speed is the truck traveling? (𝑣 = )
𝑚
(A)
(B)
(C)
(D)
31.75 m/s
15.87 m/s
17.31 m/s
19.4 m/s
DOK2
11) A force of F =200 N acts on bowling ball for t = 0.50 s. What is the bowling
ball’s change in momentum? (∆ 𝑝 = 𝐹 × 𝑡)
(A) 93 kg·m/s
(B) 100 kg·m/s
(C) 39 kg.m/s
(D) 37.2 kg.m/s
DOK2
12) A cat has a mass of m = 6 kg. The cat moves d= 2 m in a straight line in a
time of t=2s. What is the momentum of the cat? 𝑝 = 𝑚 × 𝑣
(A) 8 kg.m/s
(B) 4 kg.m/s
(C) 3 kg.m/s
(D) 6 kg.m/s
DOK2
13) The Moon has a period of T1 = 27.3 days and a mean distance of
r1 = 3.9×105 km from its center to the center of Earth. Use Kepler’s laws to
find the period of a satellite in orbit r2 = 6.70×103 km from the center of
Earth. 𝑇2 = √
(A)
(B)
(C)
(D)
𝑇12 ×𝑟23
𝑟13
0.88 days
0.06 days
0.43 days
0.026 days
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DOK2
14) What is the mass of an object that moves at a constant velocity of
𝑝
v= 3.4 m/s if its momentum is p = 4.5 kg⋅m/s? (𝑚 = )
𝑣
(A) 1.32 kg
(B) 0.66 kg
(C) 1.5 kg
(D) 6.66 kg
DOK2
15) A motorcycle can accelerate from vi = 0 to vf = 6.0 m/s in t =6 s. What is
the angular acceleration of its 0.30-m-radius wheels? 𝑎 =
(A)
(B)
(C)
(D)
𝑣𝑓 − 𝑣𝑖
𝑡
,𝛼=
𝑎
𝑟
2
3.33 rad/s
5.33 rad/s2
2.33 rad/s2
2.53 rad/s2
Part 2: Answer the following questions
DOK1
16) Explain how the Orbital speed (v) and period (T) are independent of the
mass of the satellite. (…/2)
DOK3
17) Suppose that two objects attract each other with a gravitational force of
(F). If the mass of the two objects is doubled, what is the new force of
attraction between the two objects? Explain your answer (…/2)
DOK2
18) How do seat belts really save people's lives? (Use Momentum and
Impulse theorem to explain) (…/2)
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DOK2
19) Why do planets move faster when they are closer to the Sun? (…/2)
DOK2
20) When you jump from a height to the ground, you let your legs bend at the
knees as your feet hit the floor. Explain why you do this (…/2)
Part 3: Solve the following problems
Note: (Show full steps for your work, don’t forget the units)
DOK3
21) At what distance from the earth’s surface is the acceleration due to gravity
g= 7.89 m/s2? (…/5)
m Earth = 5.97 × 1024 m
r Earth = 6371 Km
G = 6.67 ×10-11 N.m2/ kg2
𝑟= √
𝐺 ×𝑚
𝑔
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DOK3
22) A centrifuge in a medical laboratory rotates at an angular speed of
ωi = 3700 rev/min in the positive direction. When switched off, it rotates
through 46.4 revolutions before coming to rest.
a) Determine the constant angular acceleration of the centrifuge. (…/5)
𝜔𝑓2 − 𝜔𝑖2
𝛼=
2 × ∆𝜃
b) How long does it take to come to a stop? (…/2)
𝑡=
𝜔𝑓 − 𝜔𝑖
𝛼
DOK2
23) A 15 N Force acts on a 5 kg mass for 3 second.
a) The impulse which acted upon the mass. (…/2)
𝑰=𝑭×𝒕
b) What change in momentum is produced? (…/1)
𝑰 = ∆𝒑
c) Calculate the final velocity of the object. if it was initially at rest. (…/3)
𝒗𝒇 = 𝒗𝒊 + 𝒂 × 𝒕 , 𝒂 =
𝑭
𝒎
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DOK 2
24) A (m= 0.55-kg) mass is attached to a string (r= 0.75 m) long and swings in
a horizontal circle with velocity v= 4m/s.
a) What is the centripetal acceleration of the object? ( 𝑎 =
𝑣2
𝑟
). (…/2)
c) What is the tension force in the string? (𝐹 = 𝑚 × 𝑎). (…/2)
DOK 1
25) A tire of radius r=0.56m, has a constant angular acceleration of
α =4.6 rad / s2. Calculate the tangential acceleration (a) of the point on its
rim? (…/3) (𝑎 = 𝛼 × 𝑟)
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