ICSE Class 8 Physics — Flashcards for Quick Revision

A: Matter is something which occupies space, has mass and can be perceived by our senses. Examples include air, water, iron, hydrogen, oxygen, milk, oil, sugar, and salt.

A: Maharishi Kanada was an ancient Indian philosopher who considered matter to be made up of tiny particles called anu.

A: A molecule can exist free in nature and it has all the properties of that substance. A molecule is the basic unit of matter.

A: Density is the mass per unit volume of a substance. Formula: d = M / V Where: - d = density - M = mass - V = volume Unit: kg m^-3 in SI, g cm^-3 in CGS

A: Given: - Mass, M = 210 g - Volume, V = 27 cm^3 Formula: d = M / V Step 1: d = 210 g / 27 cm^3 Step 2: d = 7.78 g cm^-3 Answer: 7.78 g cm^-3

A: Different substances have different densities. A substance with lower density occupies more volume for the same mass. For example, cotton has a much larger volume than lead for equal mass because lead

A: Force is a push or pull that can change the state of rest or motion of a body, or change its size or shape.

A: A force applied to a rigid body can change only its motion. A rigid body keeps the spacing between its particles unchanged.

A: A force applied to a non-rigid body can change its motion as well as its size or shape, such as stretching or squeezing.