Forced Rotational Oscillations Stopclock

The Torsion Pendulum Apparatus is designed to study free and forced harmonic rotational oscillations. It enables students to investigate the effects of damping, resonance, and angular frequency in rotational motion. An electromagnetic eddy current brake provides adjustable damping, while a motor-driven eccentric mechanism produces forced oscillations for resonance studies. The apparatus is suitable for analyzing oscillation characteristics, determining the natural frequency, and comparing experimental results with theoretical predictions. Manufactured by Atico Export India.

Principle

The experiment is based on the rotational oscillation of a torsion pendulum. During free oscillations, the oscillation amplitude gradually decreases due to damping and follows an exponentially decaying harmonic motion. The damping level can be varied using an electromagnetic eddy current brake to study underdamped, critically damped, and overdamped conditions. Forced oscillations are produced by a motor-driven eccentric mechanism, allowing the resonance characteristics of the system to be investigated by varying the excitation frequency.

Objectives

• Study free harmonic rotational oscillations.
• Investigate forced harmonic rotational oscillations.
• Determine the natural frequency of the torsion pendulum.
• Measure the oscillation period and damping constant.
• Observe the effect of damping on oscillatory motion.
• Study resonance behavior in rotational systems.
• Compare experimental results with theoretical predictions.

System Components

Torsion Pendulum :

• Quantity: 1

DC Power Supply :

• Output: 0 to 16 V, 0 to 5 A
• Quantity: 1

Plug-In Power Supply :

• Quantity: 1

Analog Multimeter :

• Quantity: 1

Mechanical Hand-Held Stopwatch :

• Quantity: 1

Connecting Leads :

• Current Rating: 19 A
• Length: 100 cm
• Red/Blue Pair
• Quantity: 2

Free and Forced Oscillations :

• Suitable for studying both free and forced rotational oscillations.

Adjustable Eddy Current Damping :

• Electromagnetic eddy current brake provides variable damping control.

Motor-Driven Excitation :

• Eccentric drive mechanism generates controlled forced oscillations.

Resonance Demonstration :

• Enables investigation of resonance characteristics at different damping levels.

Precision Measurements :

• Facilitates accurate determination of oscillation period, damping constant, and natural frequency.

Educational Design :

• Ideal for demonstrating rotational dynamics and harmonic motion concepts.