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Work, Energy, and Simple Machines

CBSE · Class 9 · Science

Flashcards for Work, Energy, and Simple Machines — CBSE Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.

80 questions80 flashcards5 concepts

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80 Flashcards
Card 1Work

What is work done by a constant force?

Answer

Work done by a constant force is force applied multiplied by displacement in the direction of the force. Formula: W = F × s. Work is measured in joules.

Card 2कार्य

एक स्थिर बल द्वारा किया गया कार्य क्या है?

Answer

एक स्थिर बल द्वारा किया गया कार्य बल की दिशा में लगाए गए बल और विस्थापन के गुणनफल के बराबर होता है। सूत्र: W = F × s. कार्य जूल में मापा जाता है।

Card 3कार्य

कार्य किया हुआ कब शून्य के बराबर होता है?

Answer

जब बल शून्य हो या जब विस्थापन शून्य हो, तब किया गया कार्य शून्य होता है। यह तब भी शून्य होता है जब बल विस्थापन के लम्बवत कार्य करे, जैसे ऊपर की ओर बल लगाते हुए किसी डिब्बे को क्षैतिज दिशा में ले जाना।

Card 4Work

When is work done equal to zero?

Answer

Work done is zero when force is zero or when displacement is zero. It is also zero when force acts perpendicular to displacement, such as carrying a box horizontally while applying an upward force.

Card 5Work

Why is pushing a rigid wall scientifically zero work?

Answer

A rigid wall does not move, so displacement is zero. Since W = F × s, work done on the wall is zero even if the muscles feel tired.

Card 6कार्य

कठोर दीवार को धक्का देना वैज्ञानिक रूप से शून्य कार्य क्यों है?

Answer

कठोर दीवार नहीं हिलती, इसलिए विस्थापन शून्य होता है। क्योंकि W = F × s, इसलिए दीवार पर किया गया कार्य शून्य होता है, भले ही मांसपेशियाँ थक जाएँ।

Card 7कार्य

धनात्मक कार्य क्या है?

Answer

जब बल और विस्थापन एक ही दिशा में हों, तब कार्य धनात्मक होता है। उदाहरण: व्हीलचेयर को धक्का देना या डंबल को ऊपर उठाना।

Card 8Work

What is positive work?

Answer

Work is positive when force and displacement are in the same direction. Example: pushing a wheelchair or lifting a dumbbell upward.

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Frequently Asked Questions

What are the important topics in Work, Energy, and Simple Machines for CBSE Class 9 Science?
Key topics in Work, Energy, and Simple Machines include Distance vs Displacement: The Correct Decision Path, Motion - Complete Chapter Concept Overview, Chapter 7 Motion – Complete Concept Map. These are the concepts CBSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Work, Energy, and Simple Machines — CBSE Class 9 Science?
Understand the core concepts first, then work through the 80 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for Work, Energy, and Simple Machines?
There are 80 flashcards for Work, Energy, and Simple Machines covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

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