Which best explains why a bicycle slows down when its brakes are applied? * A The brakes heat the rubber on the bicycle tires.
B The brakes add energy to the bicycle.
C The brakes increase the force of gravity on the bicycle.
D The brakes cause frictional forces on the wheels of the bicycle.

Suppose you are a freshmen in college and you have not declared a major. one reason you enrolled at your respective college was the school's vibrant social life. at the same time, you want to balance your academic life because you know that your grades will matter for graduate school or job applications.you decide to forgo partying for two hours to study for an upcoming economics exam. in your first semester's principles of economics class, you learn that the enjoyment you would have received from partying is an example of a(n)