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HomeEngineering Experiments TecQuipmentTheory of Machines CENTRE OF PERCUSSION
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FREE VIBRATION OF A MASS SPRING SYSTEM
TecQuipment

CENTRE OF PERCUSSION

An experimental apparatus that shows students how to calculate and find the centre of percussion of a compound pendulum.

Brand

TecQuipment

Product type

Experiment

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Description

This product is part of a range that explores free vibrations in simple ?one degree of freedom? systems. It introduces students to key scientific terms such as:
– Simple harmonic motion (SHM) and period of oscillation
– Radius of gyration
– Centre of gravity
– Centre of percussion (CoP) and the ?sweet spot?
– Impact reactions
This product fits to the sturdy Test Frame (TM160) for study or demonstration. A centre of percussion may also be termed the ?sweet spot? of the impact of a ball against a bat or racquet. It is the impact position which allows no reaction in the hand of the user, which would otherwise create uncomfortable shocks in their arm and wrist. This product includes a metal pendulum to provide the percussion force (a ball) and a wooden pendulum to absorb the impact. The wooden pendulum forms a suspended mass, similar to a bat held underhand. A cradle fixes to the top of the Test Frame. The cradle suspends the fixed metal rod pendulum and heavy sphere beside the wooden pendulum. Self aligning bearings hold the metal pendulum to allow rotational movement only. Hardened steel knife edges rest on a smooth surface on the cradle suspending the wooden pendulum. They allow the wooden pendulum to pivot freely while also allowing some visible horizontal movement, necessary to see any reactions.

Students find the centre of gravity of the wooden (compound) pendulum to calculate its radius of gyration and centre of percussion. They then use the sphere of the metal pendulum to simulate a ball hitting the wooden pendulum at positions above, below and at the centre of percussion, noting any reaction. The wooden pendulum has a mass with adjustable position. This allows students to change its centre of gravity position for a range of tests. TecQuipment made this product to a realistic scale. This means that it produces highly visual results for demonstrations, yet the masses and inertia are still low enough for safe student use.

SKU: TM163 Categories: Engineering Experiments TecQuipment, Theory of Machines Tag: Theory of Machines
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