Lecture 7.1: Circular Motion

by Andrew Masley

| 12 QuestionsNote from the author:

Introduction lecture & practice problems to uniform circular motion variables and concepts

1

1

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

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

Which of these forces can be the centripetal force?

Gravity

Normal

Buoyant

Friction

Tension

4

1

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

A hummingbird beats its wings 80 times in 4 seconds. What is its period? (answer as a decimal, not a fraction.

6

1

What is the hummingbird's wingbeat frequency?

7

1

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

What is the frequency of the runner's motion around the track?

9

1

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

What is the car's centripetal acceleration? Round to 1 decimal place

11

1

What is the car's centripetal force? Round to 2 sig figs.

12

1

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:

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