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Energy — Flashcards

ICSE · Class 8 · Physics

35 flashcards for Energy (ICSE Class 8 Physics) to test yourself on key terms and facts. Sample: "State the definition of work in Physics."

45 questions35 flashcards7 formulas & key relations5 concepts

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35 Flashcards·
WorkUnits
Card 1Work

State the definition of work in Physics.

Answer

Work is said to be done if the force applied on a body moves it. If no motion takes place, no work is said to be done.

Card 2Work

A force of 200 N moves a body through 2 m in the direction of the force. Find the work done.

Answer

Given: Force = 200 N, Distance = 2 m Formula: W = F × d Step 1: W = 200 N × 2 m Step 2: W = 400 N m Answer: W = 400 J…

Card 3Work

Why is no work done when a person pushes a wall that does not move?

Answer

Work done depends on force and motion. If the wall does not move, distance moved is 0 m, so W = F × d = 0. Therefore, no work is done.

Card 4Work

State the formula for work done and explain the symbols.

Answer

Formula: W = F × d W = work done F = force applied d = distance moved in the direction of force Unit of work: joule (J)…

Card 5Work

A coolie raises a box of mass 50 kg to a height of 3 m. Take g = 10 N/kg. Find the work done.

Answer

Given: m = 50 kg, g = 10 N/kg, h = 3 m Force needed = mg = 50 × 10 = 500 N Formula: W = F × d Step 1: W = 500 N × 3 m Step 2: W = 1500 N m Answer: W = 1500 J…

Card 6Work

When is work done by a force equal to zero even though a force acts on the body?

Answer

Work is zero when the body does not move, or when the motion is perpendicular to the force. Examples include pushing a wall and a stone whirled in a circle by string tension.

Card 7Units

State the SI unit of work and its definition.

Answer

The SI unit of work is joule (J). 1 J = 1 N × 1 m One joule of work is done when a force of 1 newton moves a body by 1 metre in the direction of the force.

Card 8Units

Convert 1 kgf × m into joule.

Answer

1 kgf × m = 9.8 newton × metre 1 kgf × m = 9.8 joule Answer: 1 kgf × m = 9.8 J…

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Frequently Asked Questions

What are the important topics in Energy for ICSE Class 8 Physics?
Key topics in Energy include Work is done when a force, Energy is the capacity of doing, Mechanical energy is the sum, Potential energy is the energy possessed. Study these first, then practise questions on each for Class 8 exams.
How many flashcards are available for Energy?
There are 35 flashcards for Energy covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Energy for Class 8 exams?
Learn the core ideas first, then work through the 45 practice questions on Energy. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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