Work, Energy & Power Basics – Physics 2026
Work, Energy and Power is one of the most important chapters in Physics. It builds the foundation for mechanics, rotational motion, and modern physics.
At CHEMASH, this chapter is taught with real-life understanding, problem-solving practice, and exam-oriented concepts for Class 9–12, JEE & NEET 2026.
Table of Contents
- What is Work?
- What is Energy?
- Types of Energy
- What is Power?
- Important Formulas
- Real-Life Examples
- Solved Numerical
- MCQs
- FAQs
- Why CHEMASH?
1️⃣ What is Work?
In Physics, work is said to be done when a force causes displacement.
Formula:
W = F × s × cosθ
- F = Force
- s = Displacement
- θ = Angle between force and displacement
Unit: Joule (J) Dimension: [ML²T⁻²]
Important Concept:
- Positive Work → Force and displacement same direction
- Negative Work → Opposite direction
- Zero Work → No displacement
2️⃣ What is Energy?
Energy is the capacity to do work.
Energy can neither be created nor destroyed — only transformed. (Conservation of Energy)
3️⃣ Types of Energy
Kinetic Energy
Energy due to motion.
KE = ½mv²
Potential Energy
Energy due to position.
PE = mgh
4️⃣ What is Power?
Power is the rate of doing work.
P = Work / Time
SI Unit = Watt (W)
5️⃣ Important Formula Table
| Concept | Formula |
|---|---|
| Work | W = Fs cosθ |
| Kinetic Energy | KE = ½mv² |
| Potential Energy | PE = mgh |
| Power | P = W/t |
6️⃣ Real-Life Examples
- Lifting a bag → Work done against gravity
- Moving car → Kinetic energy
- Water stored in dam → Potential energy
- Electric motor → Converts electrical energy to mechanical energy
7️⃣ Solved Numerical (Exam Level)
Q: A force of 10 N moves an object by 5 m in same direction. Find work done.
W = F × s = 10 × 5 = 50 Joules
8️⃣ MCQs (Boards + JEE + NEET)
1. Unit of Power is: A) Joule B) Newton C) Watt ✔ D) Pascal
Explanation: Power = Work/Time, SI unit = Watt.
9️⃣ Frequently Asked Questions
Is Work Energy Power important for JEE 2026?
Yes, it is a core mechanics chapter with conceptual and numerical questions.
Does CHEMASH provide practice problems?
Yes, we focus strongly on numericals and concept clarity.
Why Study Physics with CHEMASH?
- Low-budget tuition for all classes
- Experienced and supportive teachers
- Strong concept + numerical approach
- Trusted by students and parents
- Board + JEE + NEET preparation
Internal Link: Laws of Motion – CHEMASH
External Reference: Energy Concepts – Physics Classroom
