Chapter 8: Rotational motion

1 revolution:

• $57\degree$

• $90\degree$

• $180\degree$

• $360\degree$

The SI unit of angular momentum is J s. It can also be expressed as:

• $kg\ m\ s^{-1}$

• $kg\ m^2\ s^{-1}$

• $kg\ m^2\ s^{-2}$

• $kg\ m^{-2}\ s^{-1}$

Revolution/minute is the unit for

• Angular displacement

• Angular acceleration

• Angular velocity

• Time

Time rate of change of angular velocity is called:

• Angular momentum

• Angular displacement

• Angular acceleration

• Time

The angular acceleration is produced by

• Momentum

• Torque

• Pressure

• Power

Moment of inertia is equal to:

• $m^2r$

• $m^2r^2$

• $m\ r$

• $m\ r^2$

Moment of inertia is measured in:

• $kg\ m^2$

• $kg\ m^{-2}$

• $N\ s$

• $rad\ s^{-1}$

The angular momentum is given by:

• $m\ \omega$

• $\omega\ \times\ F$

• $r\ \times\ F$

• $r\ \times\ P$

The direction of linear velocity of body moving in a circle is:

• Along the axis of rotation

• Along the tangent

• Directed towards the center

• Directed away from the center

The relation between linear and angular acceleration is

• $a\ =a\ \times r$

• $a\ =\ r\ \times\alpha$

• $r\ =\ a\times\ \alpha$

• $\alpha\ =\ a\times r$