Air is blown onto a sail attached to a boat from an electric fan placed on the boat. Will the boat start moving?
(B) No,the boat will not move. According to Newton's $3^{rd}$ Law of Motion,when the air from the fan pushes the sail,the sail exerts an equal and opposite force on the fan. Since the fan is attached to the boat,the system (fan + boat) experiences internal forces that cancel each other out. Motion occurs only when an external unbalanced force acts on a body. Since the fan is part of the boat,no net external force is applied to the system,and therefore,the boat will not move.
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$(a)$ State the law of conservation of momentum.
$(b)$ Mention two factors which determine the momentum of a body.
$(c)$ Prove the law of conservation of momentum with clear explanation,diagram and equation.
$(b)$ Mention two factors which determine the momentum of a body.
$(c)$ Prove the law of conservation of momentum with clear explanation,diagram and equation.
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$(b)$ Fruits fall off the branches when a strong wind blows. Give a reason.
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View Solution$A$ steam engine of mass $3 \times 10^{4} \text{ kg}$ pulls two wagons,each of mass $2 \times 10^{4} \text{ kg}$,with an acceleration of $0.2 \text{ m s}^{-2}$. Neglecting frictional forces,calculate the:
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$(i)$ force exerted by the engine.
$(ii)$ force experienced by each wagon.
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