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CBSE Class 9  >  Class 9 Notes  >  Science   >  Unit Test: Work and Energy

Unit Test: Work and Energy

Time: 1 hour 
M.M. 30 
Attempt all questions. 
Question numbers 1 to 5 carry 1 mark each. 
Question numbers 6 to 8 carry 2 marks each. 
Question numbers 9 to 11 carry 3 marks each. 
Question numbers 12 & 13 carry 5 marks each.

​Q1. What is the SI unit of work? (1 Mark)

​Q2. Define kinetic energy. (1 Mark)

​Q3. When is work done by a force considered negative? (1 Mark)

​Q4. What is the gravitational potential energy of an object at height h? (1 Mark)

​Q5. What is the SI unit of power? (1 Mark)

​Q6. Explain why no work is done when a person holds a heavy load stationary on their head. (2 Marks)

​Q7. Differentiate between kinetic and potential energy. (2 Marks)

Q8. Why does a moving object possess energy? Give an example. (2 Marks)

Q9. A ball of mass 2 kg is dropped from a height of 5 m. Calculate:
(a) The potential energy of the ball at the top.
(b) The kinetic energy of the ball just before hitting the ground.
(c) What does this example prove about the total mechanical energy?

Take g = 10 m/s². (3 Marks)

Q10. An object of mass 5 kg is moving with a velocity of 4 m/s. Calculate its kinetic energy. What happens to its kinetic energy if the velocity is doubled? (3 Marks)

Q11. Describe how a stretched rubber band acquires potential energy. (3 Marks)

Q12. Explain the law of conservation of energy with the example of a freely falling object. (5 Marks)

Q13. A 20 kg object is raised to a height of 4 m and then dropped. Calculate its potential energy at the top and kinetic energy halfway down. Explain how this illustrates energy transformation. (5 Marks)

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FAQs on Unit Test: Work and Energy

1. What is the definition of work in physics?
Ans. In physics, work is defined as the process of energy transfer that occurs when a force is applied to an object, causing it to move. Mathematically, work (W) is calculated using the formula W = F × d × cos(θ), where F is the force applied, d is the displacement of the object, and θ is the angle between the force and the direction of displacement.
2. How is energy defined in the context of physics?
Ans. Energy is defined as the capacity to do work. It exists in various forms, such as kinetic energy (the energy of motion) and potential energy (the stored energy due to an object's position or state). The total energy of a system is the sum of its kinetic and potential energy.
3. What are the different forms of energy and how do they convert from one form to another?
Ans. The main forms of energy include kinetic energy, potential energy, thermal energy, chemical energy, and electrical energy. Energy conversion occurs in many processes; for example, when a ball is thrown, chemical energy from the muscles converts to kinetic energy as it moves. Similarly, when a roller coaster descends, potential energy converts to kinetic energy as it speeds up.
4. What is the law of conservation of energy?
Ans. The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another. In a closed system, the total energy remains constant. This principle is fundamental in understanding how energy flows and changes in various physical processes.
5. How can we calculate kinetic energy and what factors does it depend on?
Ans. Kinetic energy (KE) is calculated using the formula KE = 1/2 mv², where m is the mass of the object and v is its velocity. Kinetic energy depends on both the mass of the object and the square of its velocity, meaning that even small increases in speed can lead to significant increases in kinetic energy.
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Apr 14, 2026 Last updated
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Document Description: Unit Test: Work and Energy for Class 9 2026 is part of Science Class 9 preparation. The notes and questions for Unit Test: Work and Energy have been prepared according to the Class 9 exam syllabus. Information about Unit Test: Work and Energy covers topics like and Unit Test: Work and Energy Example, for Class 9 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Unit Test: Work and Energy.
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