Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Mass is defined as the quantity of matter contained in a body.
The S.I. unit of mass is the kilogram ().
Mass is a constant quantity; it does not change regardless of the object's position in the universe.
Common instruments used to measure mass include the Beam Balance, Physical Balance, and Electronic Balance.
Sub-multiples of kilogram used for smaller masses are the gram () and milligram ().
Multiples of kilogram used for large masses are the quintal () and the metric tonne ().
A beam balance works on the principle of moments, comparing an unknown mass with a known standard mass.
📐Formulae
💡Examples
Problem 1:
A bag of rice has a mass of . Convert this mass into grams ().
Solution:
Explanation:
Since , we multiply the value in kilograms by to convert it to grams.
Problem 2:
A truck is carrying metric tonnes of coal. What is the mass of the coal in kilograms ()?
Solution:
Explanation:
To convert metric tonnes to kilograms, we use the relation .
Problem 3:
Convert into grams ().
Solution:
Explanation:
Since , we divide the milligram value by to obtain the mass in grams.