The standard of time is the same as in the metric system, the second. There is direct relation between the meter and the inch. The inch is defined at equal to 2.54 cm or 0.0254 m exactly . The unit of time is the second . Frequency is the number of oscillations of a vibrating body every second.
Frequency is the inverse of period which is the time taken for one complete oscillation.
Acceleration occurs whenever velocity changes. Mass Mass is simply the quantity of matter in a body. Force and Weight Force is a push or pull. 9.8 N. Density Density is the ratio of mass to volume of a body. Energy Energy may be potential which is static energy due to position, or kinetic due to motion .