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Circular Motion Review Flashcards | StudBud
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Circular Motion Review
Circular Motion Review
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1
What would the speed limit be if we moved this same road (r=40 m, μ=16) to the moon where g = 1.6 m/s^2?
20 m/s
128 m/s
32 m/s
1024 m/s
2
Generally, all of these are required for full marks on a question that asks for a mathematical solution:
the numerical solution, the units, the work, a free body diagram
the numerical solution
the numerical solution, the units
the numerical solution, the units, the work
3
What is the centripetal force that allows cars to turn on flat, curved roads?
tension
friction
normal force
the steering wheel
4
The law of motion that explains why the object would fly off in a straight line is:
Newton's 4th Law of Motion
Newton's 2nd Law of Motion
Newton's 3rd Law of Motion
Newton's 1st Law of Motion
5
The coefficient of friction of the curved road is 16, and the radius is 40 m. What should the speed limit be?
6400 m/s
80 m/s
40 m/s
40960000 m/s
6
If this road moved to the moon, keeping radius and coefficient of friction the same, the speed limit would not change.
True
False
7
What is The Weeknd's real name?
Mr. Zhang
Abel Makkonen Tesfaye
Samrawit Hailu
Amala Ratna Zandile Dlamini
8
Find the tension in the string of length 1.2 m swinging a 5.5 kg ball around in a circle 8 times every 3 seconds.
1853 N
920 N
2250 N
1350 N
9
What is Bruno Mars's real name?
Peter Gene Hernandez
Belcalis Marlenis Almánzar Cephus
Calvin Broadus Jr
Marshall Mathers III
10
A runner runs 2 laps in 4 minutes, or 240 seconds. What is their period?
4 minutes
2 laps
120 seconds
240 seconds
11
A washing machine can rotate at a rate of 1800 rpm (rotations per minute). What would be its period?
0.33 seconds
30 seconds
30 rotations
0.033 seconds
12
A car turns on a curved road with radius 40 m such that its period is π seconds. What is the car's velocity?
40π m/s
40 m/s
80 m/s
80 v
13
The definition of the period is:
a form of punctuation that ends a sentence
the number of revolutions an object makes per second
the time it takes an object to complete one revolution
rotations per minute
14
A 1000 kg car turns on a road with radius 40 m going 80 m/s. What are the magnitudes of Fc and Ff respectively?
2000 N; cannot be determined
160,000 N; 2000 N
160,000 N; 160,000 N
2000 N; 2000 N
15
What is the period of the Earth orbiting the sun?
1 year
1 season
1 day
1 month
16
An object is swung in a circle. What happens if the string were to snap?
The object will explode
The object will fly off in a line away from the center
The object will fly off in a straight line along its tangential velocity
The object will continue to orbit in a circle for some time
17
The force of friction acting on a turning car is 160,000 N. If the car is 1000 kg, what is the coefficient of friction?
1.6
0.6 N
0.8
16
18
Engineers would not need to account for a vehicle's mass when determining the speed limit of a curve
False
True
19
Centrifugal force is considered an "apparent" or "fictitious" force. In actuality, centrifugal force is...
inertia
Mr. Zhang
the opposite of centripetal force
a result of Newton's 3rd law of motion
20
Which of the following best supports why there must exist a speed limit on curved roads?
Air resistance becomes the dominant force at high speeds
The gravitational force increases as speed increases
Cars need to maintain constant speed to avoid mechanical failure
Roads offer limited friction
21
A toy plane is swung in a circle with a string. When the string snaps, the plane continues to fly in a circle. How?
The toy plane is affected by other forces that would cause it to turn
The toy plane defies the laws of physics
The toy plane is alive and has a mind of its own
The toy plane is on the moon
22
A car driving at a constant speed must not be accelerating because its speed does not change
False
True
23
Road A and B have the same μ. The radius of road A is twice as large as B. How much greater is road A's speed limit?
\times2
\times\sqrt{2}
Their speed limits should be the same
\times4
24
Which of the following best describes what centripetal force is?
"center-seeking force" that allows objects to move in a circle
the opposite of centrifugal force
a curved force vector that allows objects to rotate
circular forces
