
Lesson: Circular Motion
Presentation
•
Physics
•
11th Grade
•
Medium
+1
Standards-aligned
g Custer
Used 17+ times
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5 Slides • 21 Questions
1
Topic Review:
Circular Motion
​
2
3-1: The Gravitational Field
ALL objects attract each other with a force of gravitational attraction.
The force depends on the mass of the objects and the distance between their centers.
3
Multiple Choice
Force of gravity is inversely proportional to
Mass
Weight
Distance
Time
4
Multiple Choice
5
Multiple Choice
If I double the mass of one object without changing anything else, What would happen to the gravitational force between that object and any other object?
Doubles
Quadruples
Cut in Half
41 as much
6
Multiple Choice
What happens to Gravitational force if I double both of the masses but don't change their distance?
doubles
half as big
4 times bigger
41 as much or 4 times smaller
7
Multiple Choice
Find the distance between two objects whose masses are m1 = 4,500 kg, and m2 = 8,700 kg; if the gravitational force between them is F = 2.0 x 10-8 N.
130565.25 m
361.34 m
0.19575 m
0.783 m
8
3-2: Angular Velocity & Centripetal Acceleration
There are "circular" variables that correspond to linear variables.
Change in Angle, Angular Velocity, and Centripetal Acceleration.
There is also a Linear Velocity for objects in circular motion!
9
Multiple Choice
The rotational equivalent to x (displacement), v (velocity) and a (acceleration) are?
m, m/s, m/s2
θ, ω, α
x, x/t, α
μ, Σ, τ
10
Multiple Choice
Which of the following is NOT a unit of angular velocity?
Meters per second
Revolutions per minute
Revolutions per second
Rotations per second
11
Multiple Choice
A bug on a spinning record will make more turns per minute if it is located toward the center of the record.
True
False
12
Multiple Choice
Which represents the acceleration of the ball? The ball is moving counter-clockwise.
A
B
C
D
13
Multiple Choice
Where should you go on a merry go round to go fastest?
Into the middle!
Out to the edge!
Doesn't matter- rotational speed and linear speed are the same everywhere!
Jump up to go fastest!
14
3-3: Centripetal Force
This is the name given to a force moving an object in uniform circular motion.
If you lost the centripetal force the object would stop revolving and continue in a straight line tangent to the circumference of the circle.
Time Period is the number of seconds it takes for one cycle, and the inverse is Frequency.
15
Multiple Choice
If mass increases force will....
increase because they have a direct relationship
increase because they have a inverse relationship
decrease
both
16
Multiple Choice
If radius increases force will....
decrease because they have a direct relationship
decrease because they have a inverse relationship
increase
both
17
Multiple Choice
If velocity increases force will....
increase because they have a direct relationship
increase because they have a inverse relationship
decrease
both
18
Multiple Choice
19
Multiple Choice
20
Multiple Choice
A dog sits 1.50 m from the center of a merry-go-round and revolves at a tangential speed of 1.80 m/s. If the dog’s mass is 18.5 kg, what is the magnitude of the centripetal force on the dog?
56 N
21 N
40 N
98 N
21
3.4 Applications of Circular Motion
All planetary orbits are ellipses.
Planets cover equal areas in equal time periods.
Satellites move faster when closer to the sun, and slower when further away.
22
Multiple Choice
23
Multiple Choice
24
Multiple Choice
25
Multiple Choice
Earth will travel fastest in its orbit when
the earth is closest to the sun (January 3rd)
the earth is farthest from the sun (July 3rd)
26
Multiple Choice
Topic Review:
Circular Motion
​
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