. A block of mass 30 kg lies on a floor with us = 0.6 and pk = 0.3. How much force will it take keep the block moving at a constant speed? 7 Which of the following are true according to Newton's Second Law? |. For a given mass, the net force on an object is proportional to its acceleration. II. For a given net force, the acceleration is directly proportional to its mass. III. For a given acceleration, the force is directly proportional to its mass. Larry is giving his little brother an "airplane ride", swinging him in a counter-clockwise circle as shown. If Larry lets go of his brother where the arrows begin below, in which direction will his brother fly? B C A