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Questions and Answers
What is the scientific definition of work?
What is the scientific definition of work?
An object can be said to have work done on it if a force is applied but there is no movement.
An object can be said to have work done on it if a force is applied but there is no movement.
False
What do living beings need for energy?
What do living beings need for energy?
Food
Animals have to fight, move away from enemies, find food, or find a _____ place to live.
Animals have to fight, move away from enemies, find food, or find a _____ place to live.
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Match the following activities with their energy requirements:
Match the following activities with their energy requirements:
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Study Notes
Work in Everyday Life
- We use the term "work" in different ways in everyday life and science.
- Many activities we consider "work" in daily life, like studying or pushing a heavy rock, may not involve "work" under the scientific definition.
- "Work" in daily life encompasses physical or mental labor, including activities like playing, talking, and watching movies.
- The meaning of "work" is dependent on the context and can vary depending on the definition applied.
Scientific Definition of Work
- In science, "work" is defined as the product of the force applied to an object and the displacement of the object in the direction of the force.
- If a force acts on an object but there is no displacement, no work is done.
- If an object is displaced without any force acting on it, no work is done.
- Work is done only if there is a displacement of an object in the direction of the force applied.
Examples of Work and Non-Work
- Pushing a pebble on a surface and causing it to move is an example of doing work.
- Exerting force on a heavy object that does not move, such as trying to push a wall, is not considered work in scientific terms.
- A book resting on a table does not have any force acting on it and therefore does not have work done on it.
Activities for Understanding Work
- The text invites readers to consider situations where an object does not undergo displacement despite a force acting on it.
- Readers are encouraged to identify situations where an object moves without a force acting on it.
- Discussing these situations with peers can help students further understand the scientific concept of work.
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Description
Explore the concept of 'work' as it varies between everyday life and science. Learn how activities such as studying and playing may not align with the scientific definition of work, which relates to force and displacement. This quiz will help clarify these distinctions through examples and definitions.
