Simple machines are mechanical devices that are used to make work easier. Combinations of two or more simple machines working together...

It´s a common thing that our students struggle where they have to change units using conversion factors. A CONVERSION FACTOR is a...

Look around you and you find examples of things that are moving. You can probably find countless objects in motion: the hands of the...

A scientific investigation usually starts with an observation—that is, something that catches our attention. How do scientists follow up...

DENSITY is the relationship between the mass and the volume of a body. Density is measured in kg/m3 or g/cm3 .

The world most asked question. (WMAQ) The transformations that occur in physical systems can be described by the changes that occur in...

A force is a physical agent which is capable of deforming a body or modifying its stationary or mobile state. How forces are represented...

We often find that we have homogeneous and heterogeneous mixtures in which we have to separate the components without altering the nature...

With matter, we distinguish between different types of substance by whether or not we can separate them using physical methods (for...

Matter is all around us. We understand that it is anything that has mass and occupies a space, that is, everything that we can find in...

All matter around us is made up about one hundred chemical elements. Each chemical element is defined by the amount of protons in its...

The Ancient Greeks, 2500 years ago, wondered what matter around them was made up of. Some of them proposed the existence of indivisible...

The study of matter at different scales provides us with extensive knowledge about it, from its macroscopic properties (visible to the...