Understanding Angular Parameters

What is the unit of angular displacement in the International System of Units (SI)?

• Degree

• Radian

• Revolution

• Gradian

If an object completes one full revolution, what is its angular displacement in radians?

What is the angular velocity of an object rotating at 60 revolutions per minute (rpm)?

Answer explanation

If there are 60 revolutions per minute that is equivalent to 1 revolution per second (SI Units). This is the same as 360 degress which is 2pi radians.

Which of the following is the formula for angular acceleration?

If an object has an angular velocity of 5 rad/s and an angular acceleration of 2 rad/s², what will be its angular velocity after 3 seconds?

• 11 rad/s

• 9 rad/s

• 7 rad/s

• 5 rad/s

If a wheel of radius 0.5 metres is rotating at an angular velocity of 4 rad/s, what is the linear velocity at the edge of the wheel?

• 2 m/s

• 4 m/s

• 1 m/s

• 8 m/s

• 30°

• 45°

• 60°

• 90°

Which of the following represents the angular frequency of a rotating object?

If a point on a rotating disc has a tangential acceleration of 3 m/s² and the radius of the disc is 0.2 metres, what is the angular acceleration?

• 15 rad/s²

• 1.5 rad/s²

• 6 rad/s²

• 0.6 rad/s²