text: 5 questions? true or rewrite the in parentheses part to make it true. 11.the speed of a rotating object changes only if (torque) is applied to it.  12.the quantity of angular motion that is used with rotating objects is called (linear) momentum.  13.when a (torque) acts on an object, its angular momentum changes.  16.the torque on the planets orbiting the sun is zero because the gravitational force is directed toward the sun and, therefore, is not (perpendicular) to its velocity.  19.when a machine alters mechanical energy, the product of the force and distance is (zero). 11 true; 12 angular; 13 true; 16 parallel; 19 nonzero. i don't feel good about this either (like the 1st answerer). you really should have this stuff in your head. it's not difficult stuff. try visualizing these mechanical situations; that may help. or get tutoring.