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Physics Textbook Exercises
Q.no.3.2 Define the following terms:
Q.no.3.3 Differentiate between Mass and Weight.
Q.no.3.4 What is the difference between action and reaction?
Q.no.3.5 What is the law of inertia?
Q.no.3.6 Why is it dangerous to travel on the roof of a bus?
Q.no.3.7 Why does a passenger move outward when a bus takes a turn?
Q.no.3.8 How can you relate a force with the change of momentum of a body?
Q.no.3.9 What will be the tension in a rope that is pulled from its ends by two opposite forces 100 N each?
Q.no.3.10 Action and reaction are always equal and opposite; then how does a body move?
Q.no.3.11 A horse pushes the cart. If the action and reaction are equal and opposite, then how does the cart move?
Q.no.3.12 What is the law of conservation of momentum?
Q.no.3.13 Why is the law of conservation of momentum important?
Q.no.3.14 When a gun is fired, it recoils. Why?
Q.no.3.15 Describe two situations in which the force of friction is needed.
Q.no.3.16 How does oiling the moving parts of a machine lower friction?
Q.no.3.17 Describe ways to reduce friction.
Q.no.3.18 Why does the vehicle stop when the engine is switched off?
Q.no.3.19 Can the coefficient of friction be greater than 1?
Q.no.3.20 Why is the stopping distance of a fast-moving vehicle much more than a vehicle moving at a lower speed?