Work, Energy and power
ICSE · Class 10 · Physics
Flashcards for Work, Energy and power — ICSE Class 10 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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Get startedWhat is work? When is work said to be done?
Answer
Work is said to be done when a force is applied on a body and the body is displaced from its initial position. Work is done only when there is displacement under the influence of applied force. If the…
Write the formula for work done and explain each term.
Answer
Work done = Force × Displacement W = F · s Where: - W = Work done (measured in joules) - F = Applied force (measured in newtons) - s = Displacement in the direction of force (measured in meters) Whe…
What are the three special cases of work done based on the angle between force and displacement?
Answer
1. When θ = 0° (force parallel to displacement): W = F × s × cos 0° = F × s (Maximum positive work) Example: Gravitational force on freely falling body 2. When θ = 90° (force perpendicular to d…
What are the units of work? Give the relationship between them.
Answer
S.I. Unit: Joule (J) - 1 joule = work done by 1 newton force displacing a body by 1 meter C.G.S. Unit: Erg - 1 erg = work done by 1 dyne force displacing a body by 1 centimeter Relationship: 1 J = 1…
Define power. What factors does power depend on?
Answer
Power is the rate of doing work. P = Work done (W) / Time taken (t) P = W/t Power depends on two factors: 1. The amount of work done by the source 2. Time taken by the source to do the work Smaller …
Derive the expression P = F × v for power.
Answer
Starting with: P = W/t If constant force F displaces a body by distance s in time t: Work done, W = F × s Therefore: P = (F × s)/t P = F × (s/t) Since velocity v = s/t P = F × v This shows that Po…
What are the units of power? Define horse power.
Answer
S.I. Unit: Watt (W) - 1 watt = 1 joule/second - When 1 joule work is done in 1 second, power is 1 watt Other units: - 1 kilowatt (kW) = 10³ watt - 1 megawatt (MW) = 10⁶ watt Horse Power (H.P.): - Wo…
What is energy? How is it related to work?
Answer
Energy is the capacity of a body to do work. Relation with work: - When work is done ON a body → gain in energy - When work is done BY a body → loss in energy - Work done = Change in energy This is …
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