Physics Class 9 Chapter 4: Dynamics - II

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• Class 9
• Physics
• Unit 4
• FBISE SSC-I

Chapter summary

Chapter 4 of Physics for Class 9 is called "Dynamics - II". It covers 18 learning outcomes of the Federal Board syllabus. You will learn to: describe and identify states of equilibrium; analyze the dissipative effect of friction. Parhayi.com has 382 MCQs, 147 short questions and 22 long questions for this chapter.

Topics in this chapter

• Describe and identify states of equilibrium…
• Analyze the dissipative effect of friction…
• Analyze the dynamics of an object reaching terminal…
• Differentiate qualitatively between rolling and sliding…
• Justify methods to reduce friction
• Differentiate between like and unlike Parallel forces
• Analyze problems involving turning effects of forces…
• Analyze objects in equilibrium using the principle of…
• Justify experiment to verify the principle of moments
• State what is meant by center of mass and center of…
• Analyze, qualitatively, the effect of the position of the…
• Propose how the stability of an object can be improved. Illustrate the applications of stability physics in real life
• Illustrate the applications of stability physics in real…
• Predict qualitatively the motion of rotating bodies…
• Describe qualitatively motion in a circular path due to a…
• identify the sources of centripetal force in real life…
• Define and calculate average orbital speed
• Interpret and compare given planetary data…

Sample questions

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

1. Why long spanner is used to open or tight nuts of vehicle's tyre? While tightening a small nut, extra-long wrench is not suitable. Why? (3 marks)
2. Passengers are not allowed to stand on the upper deck of a double-decker bus. Explain this rule on the basis of stability. (3 marks)
3. A uniform plank 6 m long weighs 300 N and rests on two supports A and B at its ends, forming a small bridge over a drain. A man weighing 600 N stands 2 m from A. Find the reactions at A and at B. (3 marks)

What Premium gives you in this chapter

• 382 MCQs with answers and explanations
• 147 short questions with full answers
• 22 long questions with answers
• 14 Learn cards
• 36 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.