Grade 9 Science: Understanding Power
This worksheet covers fundamental concepts of power, including its definition, formulas, units, and applications in real-world scenarios for Grade 9 science students.
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Understanding Power
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Read each question carefully and answer to the best of your ability. Show all your work for calculation problems.
1. Which of the following is the correct definition of power?
The ability to do work.
The rate at which work is done.
The total energy transferred.
The force applied over a distance.
2. What are the standard SI units for power?
Joules (J)
Newtons (N)
Watts (W)
Meters (m)
1. Power is the rate at which is done or energy is .
2. The formula for power can be written as Power = Work / .
3. One watt is equivalent to one per second.
1. A student lifts a 20 N book 1.5 meters in 2 seconds. Calculate the power exerted by the student.
2. Explain the difference between work and power. Provide an example to illustrate your explanation.
1. Doing more work in less time results in less power.
True
False
2. Power is a scalar quantity.
True
False
Consider the image of a nuclear power plant below. How does the concept of power relate to the operation of such a facility?
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