Physics 9 National Book Foundation2024 Unit 04 DYNAMICSII Exercise All Long Questions

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This video is about: • Physics 9: National Book Foundation,2024 • Unit 04 : DYNAMICS-II • Exercise: All Long Questions • Q. 01. Differentiate between like and unlike parallel forces. • Q. 02. What is moment of force or torque? On what factors it depends? Write its mathematical formula • Q. 03. Define center of mass. What is effect of mass distribution in a body on its center of mass? • Q. 04. What is center of gravity? Where will be center of gravity of these regular shaped bodies; circular plate, rectangular and square shaped plate, triangular shaped plate, cylinder, sphere (also draw figures to support your answer). Differentiate between center of mass and center of gravity. • Q. 05. How can you find center of gravity of an irregular shaped thin sheet of plastic? • Q. 06. What is equilibrium? Describe the conditions of equilibrium. State an explain principle of moments. • Q. 07. Propose how the stability of an object can be improved. Illustrate the applications of stability physics in real life. • Q. 08. Define force of friction. What caused friction? What are advantages and disadvantages of frictions? Explain with examples. How can friction be reduced? • Q. 09. Compare rolling friction and sliding friction. How are they different in terms of contact surfaces, motion, and forces involved? Explain with examples. • Q. 10. Analyse the dynamic of an object reaching terminal velocity. • Q. 11. Define centripetal force. Describe the motion of a body in a circular path under the action of centripetal force. • Q. 12. Identify different sources of centripetal force in real life examples. • Q. 13. Define orbital velocity. How do scientists use the concept of orbital speed to launch satellites into specific orbits? What factors influence the chosen speed? • You can watch more educational videos on my channel ‪@mehnazkhan571‬

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