An object is moving with a constant positive velocity along positive horizontal x-axis. Which of the following statement is true?Group of answer choicesnet force on the object is non-zero in the negative direction of xthe net force on the object is equal and opposite to the kinetic friction force on the objectthe net force on the object is equal and opposite to the maximum static friction force on the object.the object must be moving on a frictionless surfacethe net force must be equal to the normal force on the object
Question
An object is moving with a constant positive velocity along positive horizontal x-axis. Which of the following statement is true?Group of answer choicesnet force on the object is non-zero in the negative direction of xthe net force on the object is equal and opposite to the kinetic friction force on the objectthe net force on the object is equal and opposite to the maximum static friction force on the object.the object must be moving on a frictionless surfacethe net force must be equal to the normal force on the object
Solution
The correct statement is: "The object must be moving on a frictionless surface."
Here's why:
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"Net force on the object is non-zero in the negative direction of x" - This is incorrect. If the object is moving with a constant velocity, the net force on it is zero. This is according to Newton's first law of motion.
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"The net force on the object is equal and opposite to the kinetic friction force on the object" - This is incorrect. If the net force was equal and opposite to the kinetic friction, the object would be slowing down, not moving at a constant velocity.
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"The net force on the object is equal and opposite to the maximum static friction force on the object" - This is incorrect. Static friction is the force that keeps an object at rest. It doesn't apply to an object in motion.
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"The object must be moving on a frictionless surface" - This is correct. If there's no friction, there's no force to slow down the object, so it can move at a constant velocity.
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"The net force must be equal to the normal force on the object" - This is incorrect.
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