Te encuentras alistándote para las vacaciones de tu vida, sales corriendo y tu maleta vacía empieza a balancearse. Si estuviera llena de tu ropa, cámara y libros, ¿cómo sería su balanceo menor, mayor o igual que antes?

As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is 100) a) static friction. b) kinetic friction. c) a combination of static and kinetic friction. d) neither static nor kinetic friction, but some other type of friction. e) it is impossible to tell what type of friction acts in this situation.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Make a drawing of the electric field lines around a positive charge, then make a second drawing of the electric field lines around a negative charge.