Energy
ICSE · Class 7 · Physics
Flashcards for Energy — ICSE Class 7 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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State the definition of energy.
Answer
Energy is the capacity to do work.
State the definition of work done by a force.
Answer
Work done = Force × Distance moved in the direction of force. Formula: W = F × d W is measured in joule, F in newton, and d in metre.
A force of 5 N moves a body by 3 m in the direction of force. Find the work done.
Answer
Given: Force, F = 5 N Distance, d = 3 m Formula: W = F × d Step 1: W = 5 N × 3 m Step 2: W = 15 N m Step 3: W = 15 J Answer: 15 J…
State the S.I. unit of work and energy.
Answer
The S.I. unit of work and energy is joule (J). 1 J = 1 N × 1 m…
A force of 8 N moves a body by 2 m in the direction of force. Find the work done in joules.
Answer
Given: F = 8 N, d = 2 m Formula: W = F × d Step 1: W = 8 N × 2 m Step 2: W = 16 N m Step 3: W = 16 J Answer: 16 J…
A force of 12 N acts on a body, but the body does not move. How much work is done?
Answer
Given: Force is applied, but distance moved = 0 m Formula: W = F × d Step 1: W = 12 N × 0 m Step 2: W = 0 J Answer: 0 J No motion means no work is done.
How is energy related to work done on a body?
Answer
When work is done on a body, its energy increases. When a body does work, its energy decreases. So, energy can be stored as a result of work done on the body.
State the definition of potential energy.
Answer
Potential energy of a body is the energy possessed by it due to its state of rest or position.
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