SI unit of torque

Definition

The SI unit of torque is the newton-meter (Nm), which measures the rotational force applied to an object. Torque quantifies the tendency of a force to rotate an object about an axis.

5 Must Know Facts For Your Next Test

1. Torque is calculated as the product of force and the perpendicular distance from the pivot point: $\tau = F \cdot r \cdot \sin(\theta)$.
2. The SI unit, newton-meter (Nm), combines the units of force (newtons) and distance (meters).
3. A counterclockwise torque is considered positive while a clockwise torque is considered negative.
4. For an object to be in rotational equilibrium, the sum of all torques acting on it must be zero.
5. In practical applications, tools like wrenches use torque to tighten or loosen bolts.

Review Questions

Related terms

Force:

A push or pull upon an object resulting from its interaction with another object. Measured in newtons (N).

Lever Arm: The perpendicular distance from the axis of rotation to the line of action of the force.

Equilibrium:

A state where all forces and torques are balanced, resulting in no linear or angular acceleration.