How are action and reaction forces different from balanced forces?
Action and reaction forces act on different objects, while balanced forces are two different forces acting on opposite directions on the same object. (p.173) 26. Why is friction (a force that opposes motion) important in making motion possible? For example, how does friction make it possible for you to walk? Without static friction between your feet and the floor, you would not be able to push forward with your leg muscles to move your body. Similarly, a car could not move without friction between the tire and the road. (p.173) 27. How can Newtons Second and Third Laws be used to predict the action and reaction of two objects that collide? The forces can be added together to find the entire force acting on each object. Then the mass of each object can be used, in solving for acceleration in the formula f=ma. (p.174) 28. If gravity pulls you towards Earth, does it also pull Earth towards you, as an equal and opposite force? Yes, gravity is an attractive force that pulls two objects with
