Work and Energy — Flashcards
NIOS · Class 10 · Science & Tech
38 flashcards for Work and Energy (NIOS Class 10 Science & Tech) to test yourself on key terms and facts. Sample: "What is work in science?"
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What is work in science?
Answer
Work is done when force is applied on a body and the body moves through some distance in the direction of the force.
When is work done equal to zero if a force is applied?
Answer
If a force is applied on a body and the body does not move, no work is done at all. Example: pushing a wall.
Why is no work done when force and displacement are perpendicular?
Answer
If the force and displacement are perpendicular to each other, the work done by the force is zero. Only the part of displacement in the direction of the force contributes to work.
How is work calculated when force and displacement are in the same direction?
Answer
Work = force × displacement in the direction of the force.
How is work calculated when force and displacement are in different directions?
Answer
W = F × PR, where PR is the projection of displacement in the direction of the force. The actual path PQ is not used for work in this case.
What is the SI unit of work?
Answer
The SI unit of work is newton-metre (Nm) or joule (J).
What does 1 joule of work mean?
Answer
1 J of work is done when a body moves 1 m under a force of 1 N in the direction of the force.
Why does a person carrying a load on the head on a level road do no work against gravity?
Answer
The load moves horizontally, so there is no displacement in the direction of gravitational force. Since force and displacement are perpendicular, work done against gravity is zero.
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