Final answer:
Forces are classified as vectors because they possess both magnitude and direction. Mass is a measure of an object's inertia, which is an intrinsic property, while weight is determined by the gravitational force on the mass. Centripetal force depends on mass, radius, and speed.
Step-by-step explanation:
Forces are classified as vectors because they have both magnitude (how strong the force is) and direction (where the force is applied). The correct answer to the question is a) Magnitude and direction. This allows forces to be represented as arrows, with the length of the arrow depicting magnitude and the arrowhead pointing in the direction of the force.
Regarding the relationship between inertia and mass, inertia is the property of an object that resists changes in velocity, and mass is a measure of an object's inertia, meaning more mass results in more inertia. Moreover, weight and mass are related yet different concepts; mass is an intrinsic property of an object and is constant regardless of location, while weight is the force exerted by gravity on that mass and can change with location.
Centripetal force, which is required for an object moving in a circular path, is impacted by mass, radius of the path, and the speed of the object. Hence, the correct answer is d. Mass, speed, and radius all impact centripetal force.