Rotational Motion

The relation between linear velocity and angular velocity

• r = v⍵

• ⍵ = vr

• v = r⍵

• a = v⍵

The unit of angular velocity is

• m/s

• m/s²

• rad/s

• rad/s²

Centripetal acceleration is directed

• directed away from the center of the circle

• directed towards the center of the circle

• it is perpendicular to the radius at that point

• It has no direction

The expression for centripetal acceleration is

• a = v⍵

• a = r⍵²

• a = v²/r

• All of the above

1 rev/min is equal to

• 2Π/60 rad/s

• 4Π/60 rad/s

• 360 rad/s

• 2Π rad/s

The number of complete revolutions per second is:

• frequency

• period

• torque

• rotational inertia

Tags

NGSS.HS-PS4-1

The time required for one complete revolution is:

• torque

• frequency

• period

• rotational kinetic energy

Tags

NGSS.HS-PS4-1

What's the centripetal acceleration of an object traveling 2.3 m/s around a circle of diameter 0.6 m?

• 5 m/s²

• 17.63 m/s²

• 10 m/s²

• 8.81 m/s²

Tags

NGSS.HS-PS2-1

A ball on a string is spun around in a circle. Which of the following quantities is not constant?

• mass

• force

• velocity

• acceleration

Tags

NGSS.HS-PS2-1

A grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed?

• 3.2 rad/s

• 26 rad/s

• 52 rad/s

• 81 rad/s