Work and Energy — Chapter Summary
NIOS · Class 10 · Science & Tech
Summary of Work and Energy for NIOS Class 10 Science & Tech. Key concepts: Work is done when force, Work done in the same and The SI unit of work.
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Overview
Work, energy, and power are closely linked ideas in science. Work is done only when a force produces displacement in the direction of the force. Energy is the capacity to do work, and power tells how fast work is done. Mechanical energy has two main forms: potential energy due to position and kineti
Key Concepts
Work is done when force
Work is done when force is applied on a body and the body moves through some distance in the direction of the force. Work is measured as force multipl
Work done in the same direction
Work done in the same direction as force is written as work = force × displacement in the direction of the force. When force and displacement are in d
The SI unit of work
The SI unit of work is newton-metre or joule. One joule of work is done when a body moves 1 m under a force of 1 N in the direction of the force.
Energy is the ability to do
Energy is the ability to do work. Energy has the same unit as work, which is joule.
Mechanical energy is the energy possessed
Mechanical energy is the energy possessed by a body because of its position or motion. It has two types: potential energy and kinetic energy.
Learning Objectives
- Define work, energy, and power with their SI units
- Explain when work is zero and when work is done by a force
- Use the formulas for work, potential energy, kinetic energy, and power
- Distinguish between potential energy and kinetic energy
- Identify different forms of energy such as thermal, light, electrical, magnetic, sound, and nuclear energy
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