Work and Power in Physics
Explore the fundamental concepts of work and power in physics, including calculations and real-world applications for Grade 8 science.
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Work and Power in Physics
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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 unit for work?
Watts
Joules
Newtons
Meters
2. Power is defined as:
Force multiplied by distance
Work done per unit time
Mass multiplied by acceleration
Energy divided by work
3. Work is done when a force causes an object to move a in the direction of the force.
4. The formula for calculating work is Work = Force × .
5. A machine that does work at a faster rate has more .
6. A student pushes against a wall with a force of 50 N for 10 seconds. Has the student done any work? Explain your answer.
7. Calculate the work done if a force of 200 N is used to push a box 5 meters.
8. A motor does 1500 Joules of work in 5 seconds. What is the power of the motor?
9. If you carry a heavy backpack across a flat field, you are doing work on the backpack.
True
False
10. The unit for power is the Joule.
True
False