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Question
An aeroplane flies at constant speed in a horizontal straight path. Two horizontal forces act on the plane. One is the thrust of the propellers that pushes it forward, and the other is the force of air resistance that acts in the opposite direction. Then:
An aeroplane flies at constant speed in a horizontal straight path. Two horizontal forces act on the plane. One is the thrust of the propellers that pushes it forward, and the other is the force of air resistance that acts in the opposite direction. Then:
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Solution
The correct option is C both thrust by propellers and air resistance are equal
The plane is moving at constant speed. From Newton's Ist law, the net external force on plane must be zero. The thrust produced by propeller and the air resistance are equal and are in opposite directions to produce zero net force.
The plane is moving at constant speed. From Newton's Ist law, the net external force on plane must be zero. The thrust produced by propeller and the air resistance are equal and are in opposite directions to produce zero net force.
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