Measurements, Dynamometer and brake tests
Measurement
In science, measurement is the process of obtaining the magnitude of a quantity, such as length or mass, relative to a unit of measurement, such as a meter or a kilogram. The term can also be used to refer to the result obtained after performing the process.
The word "measurement" is derived from the Greek word "metron" which means a limited proportion.
The history of measurements is a topic within the history of science and technology.
Laws to regulate measurement were originally developed to prevent fraud. However, units of measurement are now generally defined on a scientific basis, and are established by international treaties. In the United States, the National Institute of Standards and Technology (NIST), a division of the United States Department of Commerce, regulates commercial measurements. In the United Kingdom, the role is performed by the National Physical Laboratory (NPL).

Dynamometer
A dynamometer or "dyno" for short, is a device for measuring force, moment of force (torque), or power. For example, the power produced by an engine, motor or other rotating prime mover can be calculated by simultaneously measuring torque and rotational speed (rpm).
Brake Test
A brake test is a term used in motorsport. A driver is said to brake test another driver when the two are driving very close together and the front driver deliberately brakes very hard, causing the second driver to have to do likewise and often make an evasive manoeuvre to avoid an accident.