Test: Work, Force And Energy - 1 - Class 4 MCQ

Work in physics is the result of an external force applied to a body or object, causing it to move. It involves the application of force and results in a displacement in the direction of the force.

The formula used to calculate work is W = F × d, where W represents work, F represents force, and d represents displacement. This formula quantifies the relationship between force, displacement, and work.

Work is measured in joules (J), which is the same unit as energy. The joule represents the amount of work done when a force of one newton is applied over a displacement of one meter.

Energy refers to the capacity of a system or object to perform work. It cannot be created or destroyed but can be converted from one form to another.

Energy is measured in joules (J), which is the same unit as work. The joule represents the amount of energy transferred or transformed when one joule of work is done.

The two primary types of energy are kinetic energy, which is associated with the motion of an object, and potential energy, which is associated with the position or condition of an object.

The SI unit of energy, the joule (J), is named after James Prescott Joule, an English physicist who contributed significantly to the study of heat and energy.

Power, in this context, is defined as the rate at which work is done or energy is consumed. It represents the amount of energy transformed or work performed per unit time.

The formula used to calculate power is P = W/t, where P represents power, W represents work, and t represents time. This formula quantifies the relationship between work, time, and power.

Power is measured in watts (W). A watt is equal to joules per second (J/s) and represents the power required to perform one joule of work in one second.