Physics Class 9 Chapter 6: Work and Energy

Premium chapter

• Class 9
• Physics
• Unit 6
• FBISE SSC-I

Chapter summary

Chapter 6 of Physics for Class 9 is called "Work and Energy". It covers 17 learning outcomes of the Federal Board syllabus. You will learn to: define work done; use the equation work done = force x distance moved in. Parhayi.com has 358 MCQs, 102 short questions and 27 long questions for this chapter.

Topics in this chapter

• Define work done
• Use the equation work done = force x distance moved in…
• Define energy as the ability to do work
• Explain that energy may be stored…
• Prove that Kinetic Energy Ek = 1/2 mv^2…
• Prove and use the formula for Gravitational potential…
• Use the formulas for kinetic and Gravitational potential…
• Describe how energy is transferred and stored during…
• State and apply the principle of the conservation of…
• Justify why perpetual energy machines do not work
• Differentiate between and list renewable and non-…
• Describe how useful energy may be obtained from natural resources
• Describe advantages and disadvantages of methods of…
• Define and calculate power…
• Define and calculate efficiency…
• Apply the concept of efficiency to simple problems…
• State that a system cannot have an efficiency of 100% due…

Sample questions

Try these questions from the chapter. The answers are for Premium students.

1. Work done on the body either speeds it up or slows it down. Keeping this in mind, explain how much work is done by centripetal force on an orbiting satellite? (3 marks)
2. Why is nuclear fuel considered non-renewable although nuclear energy itself gives a huge amount of energy from a small mass? (3 marks)
3. A cricket ball of mass 0.16 kg is thrown at 25 m/s. Calculate its kinetic energy. (3 marks)

What Premium gives you in this chapter

• 358 MCQs with answers and explanations
• 102 short questions with full answers
• 27 long questions with answers
• 14 Learn cards
• 35 Activities and games
• chapter tests that show your weak topics

Physics explains how the world works, from motion and forces to heat, light and magnets. Learn each idea in simple steps, check the units, and practise numericals every day.