Lecture 7.1: Circular Motion
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by Andrew Masley
| 12 Questions
Note from the author:
Introduction lecture & practice problems to uniform circular motion variables and concepts
1
1 pt
Select all requirements for objects to move in a circle
The object is pulled around the circle by a force that points in the same direction as its velocity
The net force points outward from the circle
The net force points into the center of the circle
The velocity points parallel to the circular path
The velocity points in a perpendicular direction to the circular path
2
1 pt
You are swinging an object in a horizontal circle and let it go at point A. What will be the path of the object immediately after you let go?
A
B
C
D
3
1 pt
Which of these forces can be the centripetal force?
Gravity
Normal
Buoyant
Friction
Tension
4
1 pt
How does the centripetal acceleration affect the velocity of an object in uniform circular motion?
It changes its magnitude and direction
It changes its magnitude but not its direction
It changes its direction but not its magnitude
It does not change its direction or its magnitude
5
1 pt
A hummingbird beats its wings 80 times in 4 seconds. What is its period? (answer as a decimal, not a fraction.
6
1 pt
What is the hummingbird's wingbeat frequency?
7
1 pt
A jogger runs around a quarter of a full track in 10 seconds. What is the period of their motion around the track?
8
1 pt
What is the frequency of the runner's motion around the track?
9
1 pt
A 1000 kg car drives around a circle of radius 20 m in 10 seconds. What is its tangential velocity? Round to 1 decimal place
10
1 pt
What is the car's centripetal acceleration? Round to 1 decimal place
11
1 pt
What is the car's centripetal force? Round to 2 sig figs.
12
1 pt
Which type of force is acting as the centripetal force?
Gravity
Normal
Friction
Tension
Applied
Centripetal
Buoyant
Complete your notes by copying the two examples shown in the last part of the video below: