Questions and Answers
What is the formula for work when the force F is constant and the angle θ between the force and the displacement s is also constant?
$W = |F||s|\cos(\theta)$
When does a force do negative work?
When it has a component opposite to the direction of the displacement at the point of application of the force
What is the SI unit of work?
Joule (J)
What does work transfer from one place to another, or one form to another?
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What is the work done by the gravitational force on a ball as it falls towards the ground?
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Study Notes
Work and Force
- The formula for work when the force F is constant and the angle θ between the force and displacement s is also constant is not specified, but it is typically W = Fscosθ.
- A force does negative work when the direction of the force and the displacement are in opposite directions.
Units of Work
- The SI unit of work is the joule (J), which is equivalent to a newton-meter (N·m).
Energy Transfer
- Work transfers energy from one place to another or from one form to another.
Work and Gravity
- The work done by the gravitational force on a ball as it falls towards the ground is typically negative, as the force of gravity is in the opposite direction to the displacement of the ball.
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