Compound Measures Flashcards

A measure that combines two or more different units, such as speed, density, or pressure.

Speed = Distance ÷ Time.

Common units include metres per second (m/s) and kilometres per hour (km/h).

Density = Mass ÷ Volume.

Common units include grams per cubic centimetre (g/cm³) and kilograms per cubic metre (kg/m³).

Pressure = Force ÷ Area.

Common units include pascals (Pa) and newtons per square metre (N/m²).

To convert from m/s to km/h, multiply by 3.6. To convert from km/h to m/s, divide by 3.6.

If a car travels 150 km in 3 hours, its speed is 150 ÷ 3 = 50 km/h.

If a material has a mass of 200 g and a volume of 50 cm³, its density is 200 ÷ 50 = 4 g/cm³.