1. The factors that affect friction are:
(a) the condition of the surfaces in contact
(b) the weight of an object

2. A rough surface produces greater friction compared to a smooth surface.
(a) For example, it is harder to push or pull a heavy box along a carpet than along a tiled surface.
(b) The carpet produces greater frictional force than the tiled surface.
(c) The huge amount of frictin force impedes the box movement, making it very difficult to be moved.

3. We are more likely to slip while walking on a wet floor. This is because the wet floor is slippery and produces less friction.

4. Friction also depands on the weight of an object.
(a) A heavier object exerts a greater frictional force.
(b) Therefore, a bigger and heavier box is more difficult to be moved than a smaller and lighter box.