Q1: The following is not a law of static friction :

ANS:A - The force of friction always acts in a direction opposite to that in which the body tends to move

 "The force of friction always acts in a direction opposite to that in which the body tends to move" is a fundamental principle of friction in physics. Friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. When an external force is applied to an object, attempting to move it across another surface, the force of friction acts to resist this motion. The frictional force arises due to the interactions between the molecules at the surfaces in contact. Consider a situation where a book is placed on a table. If you push the book to the right, intending to move it across the table, the force of friction between the book and the table acts in the opposite direction, i.e., to the left. This frictional force opposes the motion or tendency of motion of the book across the table. Similarly, if you try to slide a heavy box along the floor, the force of friction between the box and the floor acts in the direction opposite to the intended motion of the box. As you push the box forward, the frictional force opposes your push by acting backward. This principle holds true not only for objects sliding across surfaces but also for situations involving rolling or fluid friction. In each case, the force of friction acts to impede the motion or tendency of motion of the object. Therefore, the statement "The force of friction always acts in a direction opposite to that in which the body tends to move" encapsulates the nature of frictional forces and their role in resisting motion between surfaces in contact.