The resistance of moving surfaces produces
friction always results in a loss of in the form of which enters the atmosphere.
friction can sometimes be the result of the attraction of different substances which are in contact with one another. true or false
oil or water clinging to a surface of a jar is a example of

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.