ICSE Class 7 Physics — Chapter Summary

Measurement is the comparison of an unknown quantity with a fixed known quantity of the same kind called the unit. Length, mass, time, and temperature are basic physical quantities. Volume tells the space occupied by an object, density compares mass with volume, and speed tells how fast a body moves

Motion is the change in position of a body with respect to a fixed point in its surroundings. Rest is the state in which a body does not change its position with respect to a fixed point in its surroundings. Rest and motion are relative, so the same object can be at rest for one observer and in moti

Energy is the capacity to do work. Work is done when a force moves a body through a distance in the direction of the force. Energy and work are measured in joules, and one joule is the work done when a force of 1 newton moves a body by 1 metre. Energy can change from one form to another, but the tot