School of Physics Lecture Demonstration Manual

Mg-1 Guinea and Feather Apparatus

Published: Thursday 09 March 2006 - Updated: Thursday 24 March 2011

Aim

To show that bodies of different mass accelerate equally under gravity.

Apparatus

Diagrams

Click on pictures to enlarge.

Guinea and Feather Pic

Guinea and Feather Diagram

Videos

Guinea and Feather Evacuated

Guinea and Feather Unevacuated

Description

A glass tube approximately one metre in length containing a lead slug and a feather is attached to an evacuating pump. The accelerations of the objects in the tube under gravity can be observed before and after evacuation.

Two minutes evacuation is sufficient for a convincing demonstration.

Safety notes

Electrical safety 

Sharps Safety 

Maintenance 

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