Which event is an example of a contact force?
A.
a nail being attracted to a magnet
B.
an electric charge jumping from a sweater to a person
C.
a leaf falling from a tree
D.
a person pulling a sled

D. A person pulling a sled

Explanation:

A contact force is any force that requires contact/touch to occur, such as kicking, pulling, or pushing something.

by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.