Common mistakes in physics

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INCORRECT:  The normal force is always equal to the force of gravity.

CORRECT:  Normal force is not always equal to force of gravity. Normal force is equal to the force of gravity if the object lies on a horizontal surface, the surface is not moving in the direction of the normal or the component of any external force in the direction of the normal is zero.

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INCORRECT:  The coefficient of friction is equals to the friction force divided by force of gravity.

INCORRECT:  The coefficient of friction is equal to the friction force divided by the normal force.

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INCORRECT:  When the acceleration is constant, then the velocity is also constant.

CORRECT:  Velocity is constant only when the acceleration is zero.

But the velocity is not constant when the acceleration is constant other than zero.

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