Lever Arm Balance

Lever Arm Balance.

Description:

A lever arm balance is a type of mechanical balance that uses the principle of moments (torque) around a pivot point to measure mass. It's a classic instrument in physics and chemistry labs to demonstrate or perform precise mass measurements.

How It Works:

The principle of moments states that for a lever to be in equilibrium, the clockwise moment must equal the anticlockwise moment:

$$\text{Force}_1 \times \text{Distance}_1 = \text{Force}_2 \times \text{Distance}_2$$

In a lever arm balance:

• There is a beam balanced at a central pivot.

• Objects are placed on pans or attached at varying distances from the pivot.

• You adjust the position or mass until the beam is level, indicating equilibrium.

Main Components:

• Beam/Lever arm – the horizontal bar

• Fulcrum/Pivot – the central support point

• Pans or hangers – to place known and unknown weights

• Pointer – indicates balance when centered

Applications:

• Demonstrating principles of torque and equilibrium

• Measuring mass using standard weights

• Calibration exercises

Advantages:

• Simple and accurate

• No need for power or electronics

• Good for educational purposes

Catalog Number:12737176