2:57 Back ufm-a4-student-materials.docx Summarizing Questions S1: First discuss these questions with your team and note your ideas. Leave space to add any different ideas that may emerge when the whole class discusses their thinking. What evidence from this activity suggests that friction is a force that opposes motion? S2: How does the row of sticky notes serve as an analogy to help understand how friction works in slowing down a moving object? That is, how does thinking about why the sticky notes slow the block down help you think about why the block slows down when sliding across the sandpaper or the table? S3: Why do you think the block slows down more rapidly on the sandpaper than on the bare tabletop? Why does it slow down at all on the apparently smooth tabletop? S4: Why do you think the cart slows down very gradually, even when no friction pad is used, but slows quickly when the pad is rubbing on the track? Use the pictures below to draw force diagrams to illustrate the difference between the two situations. Explain your reasoning below the diagrams. No friction pad Friction pad S5: Suppose you could start an object moving and then arrange for absolutely no forces to act on it. How would it move from then on? To help you think about this question consider the following: Suppose a spacecraft is at rest in deep space, far from any stars or planets, so that no form of friction or gravity is acting on it. The main engine, at the rear of the spacecraft, is fired for a period of 2 seconds (to start the spacecraft moving) and is then shut off. What do you think the motion of the spacecraft would be like after the engine is shut off? Explain your reasoning. LTE 7 looo Dashboard Calendar To Do Notifications Inbox