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Types of levers 12 Feb 2013 | 04:00 am
The lever is one of the simple machines. A lever which is a movable bar moves around a supporting point (fulcrum). Two forces act on the lever: the resisting force of the object (its weight), the d...
Principle of the lever 8 Feb 2013 | 04:00 am
Lifting an object by hand requires applying a force directly on the object. Muscular strength must be facing upwards and intensity (measured in Newtons) should be greater than the weight of the object...
Number line quiz 30 Aug 2012 | 03:00 am
Locate and identify the integer on the number line based on the two proposed indications (markers or jump). Three levels are available: level 1 for positive numbers less than 50, level 2 for number...
Decimal and Fractional Numbers 20 Aug 2012 | 03:00 am
The number line is a straight line that has an origin and stretches infinitly in two directions from its origin. An abscissa is a point on the number and can have a positive or negative value dependi...
Whole numbers (Integers) 18 Aug 2012 | 03:00 am
The number line is an infinite, graduated straight line having an origin and direction. The abscissa of a point corresponds to a positive or negative number.
Water pump 23 May 2012 | 03:00 am
A pump moves a fluid. A water supply for irrigation or consumption is a necessity for everybody. This explains the age of the first pump, invented over 5000 years ago in Mesopotamia and Asia. There a...
Submarine 10 May 2012 | 03:00 am
A submarine is a ship able to navigate under water. The principle of operation is based on finding a balance between the weight of the ship which tends to sink and buoyancy which makes the ship flo.....
Units of measurement 25 Nov 2011 | 04:00 am
Five tables are used to convert the main units of the metric system: length, mass, capacity, area, volume. The exercise mode displays random conversion operations of measurement, to solve using the t...
Quiz Eye Anatomy 28 Sep 2011 | 06:00 am
Test your knowledge of eye anatomy by labeling the diagram presented here in the shortest amount of time and with the fewest errors. Then score your performance. The scoring system takes into account ...
AC/DC 19 Sep 2011 | 10:00 am
The direct current is characterised by an unidirectional flow of electrical charges. This means that the charges are always circulating in the same direction. This is the case in nearly all electronic...
