Physics 1 Lesson: Work, Energy, Power, and Conservation of Energy |SY 2026-2027| - Strengthened SHS

Introduction to Work00:01:15

Work is defined in physics as the product of force and displacement in the direction of the force. The formula is W = Fd cos(theta), measured in Joules (J).

Positive, Negative, and Zero Work00:03:00

Work is positive when force and motion are in the same direction, negative when they oppose each other (like brakes), and zero when there is no displacement or the force is perpendicular to the motion.

Energy Forms and Kinetic Energy00:08:44

Energy is the ability to do work. Kinetic energy (KE = 1/2 mv²) represents the energy of motion, which increases with an object's mass and speed.

Potential Energy00:11:41

Potential energy (PE = mgh) is stored energy due to an object's position or height above the ground. It can be converted into kinetic energy when the object moves.

Conservation of Energy00:14:07

The law of conservation of energy states that energy cannot be created or destroyed, only transformed, which is a key principle in engineering and systems like hydroelectric plants.

Power Definition and Calculation00:15:19

Power is the rate at which work is done (P = W/t), measured in Watts (W). It measures how quickly a task is completed rather than just the amount of work performed.

Common Misconceptions and Review00:17:06

Clarification that feeling tired or holding an object still does not necessarily count as mechanical work. The video concludes by summarizing key formulas and definitions.