Class 9 Science FORCE AND LAWS OF MOTION Mix Example - FORCE AND LAWS OF MOTION

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Air is blown onto a sail attached to a boat from an electric fan placed on the boat. Will the boat start moving?

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Solution

(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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FORCE AND LAWS OF MOTION

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Mix Example - FORCE AND LAWS OF MOTION

$m_{1}$ and $m_{2}$ masses of two blocks are connected by a light spring on a smooth horizontal surface. The two masses are pulled apart and then released. Prove that the ratio of their acceleration is inversely proportional to their masses.

Medium

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An object experiences a net zero external unbalanced force. Is it possible for the object to be moving with a non-zero velocity? If yes,state the conditions that must be placed on the magnitude and direction of the velocity. If no,provide a reason.

Medium

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For a $2 \ kg$ mass,the $v-t$ graph is given. Find the force experienced by the mass in $OA$,$AB$,and $BC$.

Medium

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$A$ motor car is moving with a velocity of $108 \, km \, h^{-1}$ and it takes $4 \, s$ to stop after the brakes are applied. Find the force exerted by the brakes on the motor car if its mass along with the passengers is $1000 \, kg$.

Medium

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If a man jumps out from a boat to the bank of the river,the boat moves backwards. Identify the action and reaction in this situation.

Easy

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Air is blown onto a sail attached to a boat from an electric fan placed on the boat. Will the boat start moving?

Similar Questions

$m_{1}$ and $m_{2}$ masses of two blocks are connected by a light spring on a smooth horizontal surface. The two masses are pulled apart and then released. Prove that the ratio of their acceleration is inversely proportional to their masses.

An object experiences a net zero external unbalanced force. Is it possible for the object to be moving with a non-zero velocity? If yes,state the conditions that must be placed on the magnitude and direction of the velocity. If no,provide a reason.

For a $2 \ kg$ mass,the $v-t$ graph is given. Find the force experienced by the mass in $OA$,$AB$,and $BC$.

$A$ motor car is moving with a velocity of $108 \, km \, h^{-1}$ and it takes $4 \, s$ to stop after the brakes are applied. Find the force exerted by the brakes on the motor car if its mass along with the passengers is $1000 \, kg$.

If a man jumps out from a boat to the bank of the river,the boat moves backwards. Identify the action and reaction in this situation.

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