How do you know when a surface has produced more friction​

Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force.

Hard Rough Surfaces and Plowing

More plowing will result in a higher the friction coefficient, uplow, and thus higher sliding friction force.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.