alleryStart learning →By the convention used for angular acceleration's sign, which direction of rotation counts as positive?
AThe faster rotation
BClockwise rotation
CCounterclockwise rotation
DSign is always positive
Answer & Solution
Correct answer: C. Counterclockwise rotation
1. The convention fixes one rotation direction as positive so that signs stay consistent.
2. Counterclockwise rotation is defined as positive, and clockwise rotation as negative.
3. A counterclockwise object that speeds up therefore has a positive angular acceleration.
_Source: OpenStax Physics (CC BY 4.0), Ch 6 "Circular and Rotational Motion", section 6.3 Rotational Motion_
Keep practising Circular and Rotational Motion
Browse all Circular and Rotational Motion questions for NCEA Level 3, or explore more Physics topics.
Related questions
A fan is switched on and undergoes an angular acceleration of 150 rad/s^2 from rest. How lAn object's angular acceleration is 36 rad/s^2 and it starts at an angular velocity of 6.0An object's angular velocity changes from 3 rad/s clockwise to 8 rad/s clockwise over 5 s.A person applies a 12 N force 1.0 m from a pivot point, perpendicular to the lever arm. HoFor a given force, how should it be applied to a lever arm to maximize the torque producedWhat is the lever arm, in the definition of torque?What is torque, in physical terms?How is angular acceleration defined?