The Industrial Revolution was a period when new sources of energy, such as coal and steam, were used to power new machines designed to reduce human labor and increase production. The move to a more industrial society would forever change the face of labor. Origins of the Industrial Revolution The first Read more…
Scalar and vector quantities Scientists often make measurements. The physical quantities they measure fall into two categories: scalars and vectors. Scalar and vector quantities are treated differently in calculations. Scalar quantities A physical quantity is something that can be measured. Scalar quantities only have a magnitude or size. Examples of scalar quantities Read more…
Reproduction, the genome and gene expression The differences between sexual and asexual reproduction, the structure of DNA and its role in making proteins, mutations and their effects and how characteristics are inherited. Advantages and disadvantages of sexual and asexual reproduction Sexual reproduction involves the joining of two sex cells, or Read more…
Properties of waves Waves are one of the ways in which energy may be transferred between stores. Waves can be described as oscillations, or vibrations about a rest position. For example: sound waves cause air particles to vibrate back and forth ripples cause water particles to vibrate up and down Read more…