Summary: Physics Handbook & Study Guide Grade 11-12 Ieb A Comprehensive Guide | 9781990992384 | Kevin Smith
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2 work energy and power
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What is a scalar quantity?
- Has only magnitude
- No direction
- Example: Work
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When does a force perform no work on an object?
- Force perpendicular to displacement.
- No displacement.
- \(\cos 90^\circ = 0\), so work \(W = 0\).
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What is the unit of work?
- Joule (J)
- 1 Joule = 1 Newton × 1 meter (1 Nm)
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What is necessary to specify when measuring work on an object?
- Specify which object
- Specify which force
- Specify which distance
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What happens when force and displacement are parallel?
- Positive work is done.
- Angle \(\theta = 0^\circ\).
- \(W = F \Delta x \cos 0^\circ\).
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How is work calculated when force and displacement are at an angle?
- Work = \( F \cos \theta \Delta x \)
- \( F \) = Force
- \( \Delta x \) = Displacement
- \( \theta \) = Angle between force and displacement
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Describe the Law of Conservation of Mechanical Energy.
- Energy can't be created/destroyed.
- Converts from one form to another.
- \(E{pA} + E{kA} = E{pB} + E{kB}\).
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What will positive net work do to a system's energy?
- Positive net work will:
- Increase energy of the system.
- Increase speed of the system.
- Positive net work will:
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How do you calculate the work done by each force?
- Draw free-body diagram
- Show all forces exerted
- Use: \(W = F \Delta x \cos \theta\)
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What is the result when force and displacement are anti-parallel?
- Negative work is done.
- Angle \(\theta = 180^\circ\).
- \(W = F \Delta x \cos 180^\circ\).
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