Questions and Answers
What is the definition of work done on an object?
The product of the magnitude of the force acting on the body and the displacement in the direction of the force
What is the SI unit of energy or work?
Joule (Nm) or Kgm2s−2
What does the force component $F \cos \theta$ represent?
The component of force along the direction in which the body is displaced
Which quantity is defined as the ability to do work?
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What is the sum of kinetic energy and potential energy known as?
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What is the formula for work done on an object?
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What is the SI unit of force?
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What is the angle between the force vector and displacement vector in the formula for work done?
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What is the SI unit of energy or work?
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What is the sum of kinetic energy and potential energy?
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Study Notes
Work and Energy
- Work done on an object is defined as the product of the force applied to the object and the displacement of the object in the direction of the force.
- The SI unit of energy or work is the Joule (J).
Force and Displacement
- The force component $F \cos \theta$ represents the component of the force acting in the direction of the displacement.
- The angle between the force vector and displacement vector in the formula for work done is θ (theta).
Energy
- Energy is defined as the ability to do work.
- The SI unit of energy or work is the Joule (J).
- The sum of kinetic energy and potential energy is known as mechanical energy.
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