ICSE Class 7 Physics — Flashcards

A: Measurement is a process of comparison of the given unknown quantity with a fixed known quantity of the same kind called the unit.

A: Length is the distance between two points. Its S.I. unit is metre (m). It is measured with a metre ruler or a measuring tape.

A: Mass is the quantity of matter contained in a body. Its S.I. unit is kilogram (kg). It is measured using a beam balance or an electronic balance.

A: Motion is the state where an object's position changes with time with respect to a fixed point in its surroundings. It is the opposite of rest.

A: Rest is the state where a body does not change its position with respect to a fixed point in its surroundings.

A: Rest and motion depend on the observer and the surroundings. The same body can be at rest for one observer and in motion for another. For example, a passenger inside a moving bus may see the driver at

A: Energy is the capacity to do work.

A: Work done = Force × Distance moved in the direction of force. Formula: W = F × d W is measured in joule, F in newton, and d in metre.

A: Given: Force, F = 5 N Distance, d = 3 m Formula: W = F × d Step 1: W = 5 N × 3 m Step 2: W = 15 N m Step 3: W = 15 J Answer: 15 J