Which will cause more friction: a rough surface or a smooth surface? Why?
Fill in the blanks.
(a) The incident ray, the normal and the reflected ray are all in the same ………… .
(b) Reflection from a rough surface is called ………… reflection.
(c) In a periscope, we see ………… reflection of an object.
(d) In a plane mirror, the image is ………… inverted.
Work done is greater in moving a heavier object than a lighter object through the same distance on a same rough surface.