Energy
ICSE · Class 8 · Physics
Flashcards for Energy — ICSE Class 8 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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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.
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…
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.
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)…
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…
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.
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.
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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