Physics 121 - Exam 1 Question and answers rated 2025

Physics 121 - Exam 1 Question and
answers rated 2025
by what factor - correct answer ✔ratio: new/old


percentage - correct answer ✔(new-old)/old X 100%


mechanics - correct answer ✔the branch of physics that considers how
interactions between objects affect the motion of those objects


long range forces - correct answer ✔forces that do not require the two
objects to be touching; ex: gravity, electric/magnetic


contact forces - correct answer ✔forces that exist only as long as the objects
are touching one another; ex: tension, friction, normal


magnitude - correct answer ✔the size or strength of a force


scalar - correct answer ✔quantities that can have magnitude, algebraic sign
(positive or negative), and units, but not a direction in space; ex: time, mass,
volume, etc.


vector - correct answer ✔quantities that have a direction in space as well as
a magnitude; requires special math; ex: force, velocity, displacement, position,
acceleration, etc.


components - correct answer ✔the x- y- and z- parts of a vector that indicate
the magnitude and direction of the three vectors along the axes