List five situations in which a greater amount of friction is beneficial. overall, would a high or low coefficient of friction be in these situations?

Few of the following cases while it requires friction or friction is beneficial is as following

1). While applying brakes during motion of car or any vehicle friction is required

2). While we have to take a turn on the road then it requires friction force due to which we will get centripetal force to take turn.

3). While writing on paper it requires friction between pen and paper.

4). While walking or running on road friction will provide sufficient force to move on the surface.

5). To hold the heavy objects against vertical wall it requires friction force on the wall due to which it is balanced.

In all above situations the friction force is required and the coefficient of friction must be more in all above cases.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.