22. Centripetal Motion

22. Centripetal Motion

Kahoot! Code:

07682107

Multiple Choice

If a circulating object is moving with constant speed is it also moving with constant velocity?

• Yes, because speed and velocity are the same

• No because it's constantly changing direction

• Idk tbh

Multiple Choice

Check for Understanding:

A CD has a diameter of 12 cm and spins around once in 0.1 seconds.

Correctly identify the givens:

• r = 12 cm

  T = 0.1 s

• r = 0.06 m

  T= 0.1 s

• r = 6 m

  T = 0.1 s

Multiple Choice

A CD has a diameter of 12 cm and spins around once in 0.1 seconds.

Now, if a lady bug rides on the outside edge of the disk, how fast is it going?

• 377 m/s

• 3.8 m/s

• 754 m/s

Multiple Choice

So the lady bug is going at a speed of 3.8 m/s, the CD has a diameter of 0.12 m and spins around once in 0.1 seconds. What is its centripetal acceleration?

• 241 m/s²

• 63 m/s²

• 120 m/s²

• 32 m/s²

Multiple Choice

What causes an object to accelerate?

• An unbalanced net force

• A balanced net force

• Any force

Multiple Choice

In what direction is the ball going to fly when the string breaks?

Multiple Choice

So the lady bug is going at a speed of 3.8 m/s, accelerates at 241 m/s², the CD has a diameter of 0.12 m and spins around once in 0.1 seconds.

Let’s say it’s huuuuuge monster ladybug and has a mass of 0.01 kg.

Then what centripetal force is it experiencing?

• 24,100 N

• 24,100 m/s²

• 2.41 N

• 2.41 m/s²

Multiple Choice

This is our little ladybug on the record, rotating clockwise.

Choose the correct velocity, force and acceleration vectors that are showing what the ladybug is experiencing:

Google "phet lab ladybug" and click on the first result