The four main resistance forces are objects with mass, inertia, and momentum; friction; gravity; and air resistance. Objects with mass are able to provide resistance by colliding with other objects. Friction slows objects down by providing a steady resistance when the objects are in contact with and rubbing against a surface. Gravity provides a steady downward pull towards the center of earth’s mass. Air resistance is the cumulative force provided by millions of oxygen atoms being displaced.
<span>D is the correct answer. It is important for fitness centre staff to be certified so they can provide safe instruction, and friendly and helpful so the customer would like to return.</span>
Being overweight; unsafe sexual behavior Smoking; being overweight Being overweight; high levels of stress Abuse of alcohol or other drugs; unsafe sexual behavior.
