# 9th Class Physics Chapter 3 Important Long Questions 2024

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## 9th Class Physics Chapter 3 Long Questions Notes

• What is the law of Inertia?
• Why is it dangerous to travel on the roof of a bus?
• Why does a passenger move outward when a bus takes a turn? How can you relate a force with the change of momentum of a body?
• What will be the tension in a rope that is pulled from its ends by two opposite forces 100 N each?
• Action and reaction are always equal and opposite. Then how does a body move?
• A horse pulls the cart. If the action and reaction are equal and opposite then how does the cart move?
• What is the law of conservation of momentum?
• Why is the law of conservation of momentum important?
• When a gun is fired, it recoils. Why?
• Describe two situations in which force of friction is needed.
• How does oiling the moving parts of a machine lowers friction?
• Describe ways to reduce friction.
• Why rolling friction is less than sliding friction?
• (vii) Cream separator
• What would happen if all friction suddenly disappears?
• Why the spinner of a washing machine is made to spin at a very high speed?
• Define the following terms:
• (i) Inertia
• (ii) Momentum
• (iii) Force
• (iv) Force of friction
• (v) Centripetal force
• What is the difference between:
• (i) Mass and weight
• (ii) Action and reaction
• (iii) Sliding friction and rolling friction
• What you know about the following:
• (i) Tension in a string
• (ii) Limiting force of friction
• (iii) Braking force
• (iv) Skidding of vehicles
• (v) Seatbelts