Friction is:

I. A force that acts parallel to two surfaces in contact: This is correct. Friction is a force that acts along the surface of contact between two objects, opposing their relative motion.

II. A force that opposes relative motion: This is also correct. The primary function of friction is to resist the motion of an object relative to another. For example, when you try to slide a book across a table, friction between the book and the table opposes this motion.

III. A force that acts through the centre of mass: This is not correct. Friction does not necessarily act through the centre of mass. It acts at the point or points of contact between the two surfaces.

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Friction is:

I. A force that acts parallel to two surfaces in contact: This is correct. Friction is a force that acts along the surface of contact between two objects, opposing their relative motion.

II. A force that opposes relative motion: This is also correct. The primary function of friction is to resist the motion of an object relative to another. For example, when you try to slide a book across a table, friction between the book and the table opposes this motion.

III. A force that acts through the centre of mass: This is not correct. Friction does not necessarily act through the centre of mass. It acts at the point or points of contact between the two surfaces.

Knowee AI · Accepted Answer

Friction is:

I. A force that acts parallel to two surfaces in contact: This is correct. Friction is a force that acts along the surface of contact between two objects, opposing their relative motion.

II. A force that opposes relative motion: This is also correct. The primary function of friction is to resist the motion of an object relative to another. For example, when you try to slide a book across a table, friction between the book and the table opposes this motion.

III. A force that acts through the centre of mass: This is not correct. Friction does not necessarily act through the centre of mass. It acts at the point or points of contact between the two surfaces.

What is friction?I. A force that acts parallel to two surfaces in contactII. A force that opposes relative motionIII. A force that acts through the centre of mass

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