Work – A Scientific Definition — Reading Comprehension
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MS-PS3-5
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This NGSS-aligned science passage explains the definition of work as used in physical science and supports standard MS-PS3-5. It teaches that scientific work happens only when force causes an object to move in the same direction as the force. The passage introduces the formula for calculating work (Work = Force × Distance), explains that work is measured in joules, and gives real-world examples students can relate to, such as pushing a box or lifting a backpack. Students also learn how doing work transfers energy to objects. The passage helps build vocabulary, improve reading comprehension, and connect core NGSS concepts to everyday experiences. It is ideal for middle school science instruction and energy transfer discussions.
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In science, work has a specific meaning. Work happens when a force is applied to an object and that object moves in the direction of the force. If there’s no movement, no work has been done—even if a lot of effort was used. This is different from how we often use the word “work” in everyday language.
For work to occur, two things must happen: a force must be applied, and the object must move in the direction of that force. The amount of work done depends on how much force is used and how far the object moves. The formula for work is: Work = Force × Distance The unit for work is the joule (J)—the same unit used to measure energy.
Let’s look at a real example. If you push a box across the floor, you are doing work because you are applying force and the box is moving in the same direction. But if you push against a wall and the wall doesn’t move, you’ve used effort, but no work has been done—scientifically speaking—because the wall didn’t move.
Work is one of the ways energy is transferred. When you do work on an object, you are giving it energy. For example, lifting a backpack off the ground gives it gravitational potential energy. This concept connects directly to the law of conservation of energy and helps us understand how forces and energy interact in the physical world.
Fun Fact: Carrying a heavy book across a room doesn’t count as “work” in science—because the force (upward) and the motion (forward) are in different directions!
When is work done in science?
When something gets hotWhen effort is usedWhen force causes movementWhen energy is stored
Which formula shows how to calculate work?
Work = Mass × SpeedWork = Force × DistanceWork = Energy ÷ TimeWork = Distance + Effort
What unit is used to measure work?
WattNewtonJouleMeter
What must happen for work to occur?
Force and timeEnergy and directionForce and movementDistance and mass
Why isn’t pushing against a wall considered work?
The wall pushes backNo force is usedThe wall didn’t moveIt’s too hard
How does doing work transfer energy?
It stops energyIt adds heatIt gives energy to objectsIt destroys energy
What is the main idea of the passage?
Work only happens in machinesWork is effort in any situationWork requires motion from forceWork is a form of rest
If a student lifts a book 2 meters using 10 newtons of force, how much work is done?
20 joules12 joules5 joules8 joules
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