2. What do bumps and hollows do to the surface of an object?A. They smoothens it. B. They make it more rough. C. They make it shiny. D. They make it wet. 3. Why does a cart move faster on a cemented road than on a bumpy road?A. Friction is greater on a cemented road. B. Friction is lesser on a cemented road. C. There is no friction on a cemented road. D. The cart can roll only on a cemented road. 4. Which concept explains why you don’t easily feel tired when you go down the stairs?A. FrictionB. MotionC. Energy at restD. Gravity 5. Why will your shoes wear out easily on a rough road than on a smooth road?A. There is greater friction on a rough road. B. It is difficult to walk on a rough road. C. You walk slowly on a shiny floor. D. You need longer time to walk on a rough road is​.