10.lf the mass of a car is tripled and its speed is doubled. then the Kinetic energy changes by a factor of: (K) a. 0.67 d. 12 b. 1.5 e. 18 c. 6 11.lf done long enough, rubbing two sticks together can produce enough heat to start a re. If 100.0 J of thermal energy is required to start the fire and the average frictional force between the sticks is 20.0 N, the distance the sticks must slide past one other is: (K) a. 2.00 m d. 100.0 m b. 5.00 m e. 2.00 x 103 m c. 10.0m 12. To catch a water-filled balloon without breaking it, people allow their hands to move with the balloon upon catching it. This works because: (K) the balloon's momentum changes more slowly there is less force applied there is less impulse two of A, B, and C all of A. B. and C 990