1. Hina is studying the measurement of atmospheric pressure. She learns that a mercury barometer was invented by Torricelli. What liquid is used in a Torricelli barometer?
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Ch 5 + Chapter 6: Work and Energy
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2. Mohamed is learning about the hydraulic lift. He understands that a hydraulic lift uses Pascal's principle to multiply force. If a small piston with area 0.1 m² is pushed with a force of 100 N, what is the force on a large piston with area 2 m²?
3. Ibrahim is studying wind energy. He knows that wind turbines convert kinetic energy into electrical energy. What is the source of wind energy?
4. Xia is studying efficiency. She knows that no machine is 100% efficient because some energy is lost as heat. What happens to the lost energy in a machine?
5. Xia is studying the law of conservation of energy. She knows that energy can be converted from one form to another. In a hydroelectric dam, what energy conversion takes place?
6. According to Hooke’s Law, force is proportional to:
7. Energy is defined as:
8. Why do sharp knives cut better?
9. If more work is done in less time, power will be:
10. David is studying fossil fuels. He knows that fossil fuels are formed from the remains of ancient organisms. Which of the following is a fossil fuel?
11. Power is defined as:
12. Bilal is holding a heavy book stationary at a height of 1 meter above the ground. He is exerting an upward force, but the book does not move. How much work is Bilal doing on the book?
13. Victor is studying energy resources. He knows that fossil fuels are non-renewable. Which of the following is a renewable energy resource?
14. Tina is studying power. She knows that power is the rate of doing work. If a machine does 1000 J of work in 2 seconds, what is its power?
15. Which material shows elasticity?
16. Energy stored due to height is called:
17. Waseem is studying the work-energy theorem. He knows that the work done on an object is equal to the change in its kinetic energy. If a force does 500 J of work on an object, what is the change in kinetic energy?
18. What happens to the shape of a body when a force is applied?
19. Why is atmospheric pressure lower on mountains?
20. Hina is studying the conservation of energy. She knows that energy can neither be created nor destroyed, but it can be converted from one form to another. When a pendulum swings, what happens to its energy at the highest point?
21. Julia is studying wave energy. She knows that wave energy is generated by the movement of waves. What type of energy is wave energy?
22. Fatima is calculating the potential energy of a 2 kg object placed at a height of 3 meters above the ground. What is the potential energy? (Take g = 10 m/s²)
23. George is learning about atmospheric pressure and weather. He understands that changes in atmospheric pressure can indicate weather changes. Which of the following is associated with high pressure?
24. Which law states that energy cannot be created or destroyed?
25. Ming is studying efficiency. He knows that efficiency is a measure of how well a machine converts input energy to useful output. If a machine has an efficiency of 40%, what percentage of input energy is wasted?
26. Which unit is used for energy?
27. When a body falls freely, its potential energy is converted into:
28. Nora is studying geothermal resources. She knows that geothermal energy comes from the Earth's internal heat. Which of the following is a source of geothermal energy?
29. Beyond elastic limit, a material:
30. The SI unit of work is: