Work, Energy, and Simple Machines — Flashcards
CBSE · Class 9 · Science
80 flashcards for Work, Energy, and Simple Machines (CBSE Class 9 Science) to test yourself on key terms and facts.
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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.
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।…
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।…
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.
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.
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।…
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।…
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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- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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