Work, Energy, and Simple Machines-Assignments - What Have You Learned? Science Exploration Class 9 In English-CBSE Notes
Explore NCERT Solutions for Class 9 science exploration Chapter Work, Energy, and Simple Machines Topic Assignments - What Have You Learned? with simple explanations and free ncert solution in English.
Class 9 Science Exploration Exploration Chapter 7 Work, Energy, and Simple Machines Assignments - What Have You Learned?
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All Topics Chapter Work, Energy, and Simple Machines
- 1. Chapter Review and Key Points
- 2. Work in Science
- 3. Work And Energy
- 4. Potential Energy
- 5. Simple Machine And Power
- 6. Conservation of Mechanical Energy
- 7. Assignments - What Have You Learned?
Notes
Work, Energy, and Simple Machines-Assignments - What Have You Learned? Science Exploration Class 9 In English-CBSE Notes
Work, Energy, and Simple Machines
Assignments - What Have You Learned?
Chapter 7. Work, Energy, and Simple Machines
This assignment is based on the complete chapter and follows the latest CBSE competency-based assessment pattern. It includes objective, descriptive, application-based, case-study and HOTS questions to strengthen conceptual understanding of work, energy, power and simple machines.
Chapter Assignment
1. One Word Answer
- The capacity to do work.
- The SI unit of work.
- The SI unit of power.
- Energy possessed due to motion.
- Energy possessed due to position.
- The product of force and displacement.
- The law stating that energy can neither be created nor destroyed.
- The quantity that measures the rate of doing work.
- The ratio of load to effort.
- A device that makes work easier.
2. Fill in the Blanks
- Work is done only when force produces __________.
- The SI unit of energy is __________.
- Work = __________ × Displacement.
- Kinetic energy depends on mass and __________.
- The formula of potential energy is __________.
- Mechanical energy is the sum of __________ and __________.
- Power = __________ ÷ Time.
- The SI unit of power is __________.
- The efficiency of a machine is always __________ than 100%.
- A pulley is an example of a __________ machine.
3. True or False
- Pushing a wall without moving it is an example of scientific work.
- One joule is equal to one newton metre.
- Potential energy depends upon the height of the object.
- Kinetic energy becomes zero when an object is at rest.
- Mechanical energy always remains constant in the absence of friction.
- Power and energy are the same physical quantities.
- Simple machines create energy.
- Mechanical advantage can be greater than one.
- Efficiency of an ideal machine is 100%.
- A ramp is an example of an inclined plane.
4. Match the Following
| Column A | Column B |
|---|---|
| Work | Force × Displacement |
| Energy | Capacity to do work |
| Kinetic Energy | Energy due to motion |
| Potential Energy | Energy due to position |
| Power | Work done per unit time |
| Lever | Crowbar |
| Pulley | Draws water from a well |
| Wheel and Axle | Bicycle |
| Inclined Plane | Ramp |
| Screw | Bolt |
5. Very Short Answer Questions
- Define work.
- State the conditions necessary for work to be done.
- Write the formula for work.
- Define energy.
- What is kinetic energy?
- What is potential energy?
- State the law of conservation of mechanical energy.
- Define power.
- What is a simple machine?
- Define mechanical advantage.
6. Short Answer Questions
- Differentiate between positive, negative and zero work with suitable examples.
- Explain the Work-Energy Theorem.
- Describe the different forms of energy with examples.
- Explain kinetic energy and the factors affecting it.
- Explain potential energy with suitable examples.
- Describe the conservation of mechanical energy during the free fall of an object.
- Differentiate between kinetic energy and potential energy.
- Explain the concept of power and its SI unit.
- What are simple machines? Explain their importance in daily life.
- Explain mechanical advantage, velocity ratio and efficiency.
7. Long Answer Questions
- Explain the concept of work with its conditions, formula, SI unit and real-life applications.
- Describe the different forms of energy and explain the relationship between work and energy.
- Explain kinetic energy, potential energy and mechanical energy with suitable examples.
- State and explain the law of conservation of mechanical energy using the example of a freely falling object.
- Explain the concept of power and discuss its practical applications.
- Describe different types of simple machines with suitable examples.
- Explain mechanical advantage, velocity ratio and efficiency with appropriate diagrams or examples.
- Discuss the importance of simple machines in transportation, construction and household work.
8. Case Study Questions
Case Study – 1
A worker pushes a heavy box across the floor. The box moves in the direction of the applied force.
- Is work done in this situation?
- Which two quantities determine the work done?
- Write the formula for work.
- Name the SI unit of work.
Case Study – 2
A ball is thrown vertically upward. It slows down, stops for a moment, and then falls back to the ground.
- Which type of energy is maximum at the highest point?
- Which type of energy is maximum just before reaching the ground?
- Which law explains this change of energy?
- What happens to the total mechanical energy (ignoring friction)?
Case Study – 3
A student climbs a staircase carrying a school bag to the first floor.
- Which type of energy increases?
- Has work been done? Give a reason.
- Which force acts against the motion?
- State the formula for potential energy.
Case Study – 4
A mechanic uses a pulley to lift a heavy engine.
- Which simple machine is used?
- Why is a pulley useful?
- Define mechanical advantage.
- Why is the efficiency of a practical machine less than 100%?
Case Study – 5
Two students lift the same object to the same height. One student takes less time than the other.
- Did both students perform the same amount of work?
- Which student produced greater power?
- Define power.
- Write its SI unit.
9. Competency-Based Questions
- Why is no scientific work done while pushing a wall that does not move?
- Explain why a fast-moving car possesses more kinetic energy than a slow-moving car.
- Why does water stored in a dam have potential energy?
- How does a roller coaster demonstrate the conservation of mechanical energy?
- Why is power an important factor in selecting machines?
- Explain why the efficiency of practical machines is always less than 100%.
- How does an inclined plane reduce human effort?
- Why do engineers use pulleys and levers in construction work?
- Explain the energy transformations that occur in a hydroelectric power station.
- Give two examples from daily life where simple machines make work easier.
10. HOTS Questions
- A person carries a heavy suitcase on a horizontal road. Under what condition is scientific work considered zero? Explain.
- Two objects have the same mass, but one moves twice as fast as the other. Compare their kinetic energies.
- Why does the total mechanical energy remain constant during free fall even though kinetic and potential energies keep changing?
- Can a machine reduce the total work done? Justify your answer.
- Why is a longer ramp easier to use than lifting a load vertically?
- Explain why a powerful motor can complete the same work in less time.
- How would daily life be affected if simple machines did not exist?
- A machine has a high mechanical advantage but low efficiency. Explain how this is possible.
- Give one real-life example where energy changes through more than two forms before performing useful work.
- Why are work, energy and power considered closely related physical quantities? Explain with suitable examples.
All Topics Chapter Work, Energy, and Simple Machines
Work, Energy, and Simple Machines-Assignments - What Have You Learned? Science Exploration Class 9 In English-CBSE Notes
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CBSE Notes for Class 9 science exploration Chapter Work, Energy, and Simple Machines – Assignments - What Have You Learned?
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Work, Energy, and Simple Machines-Assignments - What Have You Learned? Science Exploration Class 9 In English-CBSE Notes Study Materials For Class 6 to 12
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