Question

what happens to friction when the mass of an object increases?
o friction stays the same
o friction decreases
o friction only changes if the surface changes
o friction increases

question 18 1 pts
which surface would have the greatest friction?
o ice
o sandpaper
o smooth wood
o glass

Explanation:

For the first question, the force of friction is directly proportional to the normal force, and as mass increases, the normal force (on a flat - surface) increases, thus friction increases. For the second question, sandpaper has a rough surface which creates more resistance and hence greater friction compared to ice, smooth wood, and glass.

Answer:

• friction increases
• sandpaper