Which of these statements describe the properties of friction?
A. Friction helps to induce magnetism
B. Friction acts in the opposite direction of relative motion.
C. Friction causes the surfaces in contact to wear away.
D. Friction produces heat energy.
B, C & D
Friction is not responsible for magnetism even though we can magnetise a non-magnetic substance by rubbing it with a magnet. It is the magnetic field that causes this phenomenon. Hence all other options are correct apart from option A.