Lever arm
from class:
College Physics II – Mechanics, Sound, Oscillations, and Waves
Definition
The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. It is a crucial factor in determining the torque produced by a force.
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5 Must Know Facts For Your Next Test
- The magnitude of torque is calculated as the product of the force and the lever arm: $\tau = rF\sin(\theta)$.
- A longer lever arm results in greater torque for a given force.
- The lever arm is always perpendicular to the line of action of the force.
- If multiple forces act on an object, each has its own lever arm contributing to net torque.
- In rotational equilibrium, the sum of all torques acting on an object is zero.
Review Questions
- How does increasing the length of the lever arm affect torque?
- What is the relationship between lever arm and angle when calculating torque?
- In what condition will an object be in rotational equilibrium concerning torques?
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