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A symmetrical lever with some mass pieces each of which has a weight of 1.0 N. The lever arms can be read from the coloured rectangles; one rectangle corresponds to 0.10 m. The lever is in balance when the applet is started. You can attach a new mass piece or put it to another place with pressed mouse button. In a similar way you can remove a mass piece by clicking on it.

Software/Applets used on this page

Based on free Java applets from Java Applets on Physics



a measure of the quantity of matter in an object


a force which acts upon masses in a gravitational field. Near the surface of the Earth, the acceleration due to gravity is approximately constant; this means that an object's weight is roughly proportional to its mass. Weight and mass are fundamentally different quantities: mass is an intrinsic property of matter, whereas weight is a force that results from the action of gravity on matter: it measures how strongly gravity pulls on that matter.

Full Glossary List

This question appears in the following syllabi:

SyllabusModuleSectionTopicExam Year
AQA A-Level (UK - Pre-2017)M2MomentsBasic moments-
AQA A2 Maths 2017MechanicsMoments and UnitsMoments-
AQA AS/A2 Maths 2017MechanicsMoments and UnitsMoments-
CCEA A-Level (NI)M1MomentsBasic moments-
CIE A-Level (UK)M2MomentsBasic moments-
Edexcel A-Level (UK - Pre-2017)M1MomentsBasic moments-
Edexcel A2 Maths 2017MechanicsMomentsMoments-
Edexcel AS/A2 Maths 2017MechanicsMomentsMoments-
OCR A-Level (UK - Pre-2017)M2MomentsBasic moments-
OCR A2 Maths 2017MechanicsMomentsMoments-
OCR MEI A2 Maths 2017MechanicsMomentsMoments-
OCR-MEI A-Level (UK - Pre-2017)M2MomentsBasic moments-
Universal (all site questions)MMomentsBasic moments-
WJEC A-Level (Wales)M1MomentsBasic moments-