Rotational Motion Parameters

2600 rev/min is equivalent to which of the following?

(HINT: Convert revolutions to radians using 2Pi radians/rev & convert min to seconds using 60 seconds/minute )

• 2600 rad/s

• 43.3 rad/s

• 273 rad/s

• 60 rad/s

A grindstone spinning at the rate of 8.3 rev/s has what approximate angular velocity? ( HINT: 1 revolution = 2Pi radians and Pi ~ 3.14 )

• 3.2 rad/s

• 26 rad/s

• 52 rad/s

• 81 rad/s

An object rotates through 90 degrees. What is it's angular displacement in radians? ( Hint: 2Pi radians = 360 degrees )

• 90

• Pi

• Pi/2

• 2Pi

A top makes 10 revolutions in 1 second. What is its angular velocity in radians/sec? ( HINT: 2Pi radians = 360 degrees )

• 20Pi radians/sec

• 3600 radians/sec

• 10 radian/sec

• 573 radians/sec

What is angular acceleration?

• How far an object rotates at a given speed

• The change in angular velocity divided by time

• Same as linear acceleration

• The change in linear velocity divided by time

Name 3 things that rotate

Tags

NGSS.MS-ESS1-1

Explain the differences between Linear Motion and Rotational Motion.

What is a "radian"?

• A new kind of light bulb

• An angle defined by 1 radius of length on the outside of a circle

• Same as degrees

• 2 pies

What is "centripetal acceleration"?

• The gas pedal on a car

• The acceleration that changes linear motion into rotational motion

• Moving backwards

• Speeding up and/or slowing down

Tags

NGSS.HS-PS2-1

Radius = 3 m, velocity = 9 m/s. Compute centripetal acceleration.

 $Hint:\ Centripetal\ Acceleration\ =\ \frac{v^2}{r}$  

• 100 m/s

• 27 m/s

• 27 m/s^2

• 9 m/s

Tags

NGSS.HS-PS2-1