Work and Energy — Flashcards

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In science, work is done when a force moves an object in the direction of the force. If there's no movement, no work is done. For example, pushing a wall does not count as work because the wall doesn’…

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No, reading a book is not considered work in science because no force is moving an object. But turning a page is work because you use force to move the page.

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Work is not done when the object does not move. For example, pushing a heavy rock that doesn’t budge means no work is done, even though you are using force.

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1. Lifting a school bag from the floor. 2. Kicking a football – your foot applies force and the ball moves.

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Energy is the ability or capacity to do work. We need energy to run, walk, or even think. It comes from food, the Sun, and fuels.

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Running needs more energy because we move faster and cover more distance in less time. More force and movement mean more work, so more energy is used.

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Cars get energy from fuels like petrol or diesel. When the fuel burns in the engine, it releases energy that makes the car move.

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The main forms of energy are: Heat, Light, Sound, Electrical, and Mechanical energy. Each helps us do different kinds of work.