Miscellaneous 1
Define scalar and vector quantities.
Scalar - A measurable quantity with only magnitude
Vector - A measurable quantity that has magnitude and direction
The sum of all forces acting on an object
What is net force?
a vector quantity describes a change in position
what is displacement?
the friction force that acts on rolling objects
what is rolling friction?
Newton's Second Law
(F=ma) Force equals mass times acceleration
A coordinate system used to describe the motion of an object.
What is Frame of Reference?
Examples of contact and field forces:
Contact: opening a drawer, pushing pulling, etc.
Field: gravity, magnetism, etc.
Displacement, acceleration, force, and velocity are all _____ quantities.
What is Vector?
A force that opposes motion between two surfaces that are in contact.
What is friction?
The tendency of an object to resist a change in motion (Newton's First Law)
What is Inertia?
A force of attraction between objects that is due to their masses.
What is gravity?
Define tension.
a pulling force that acts in a rope, string, or other object
how forces change an object's motion
what is Dynamics?
Define traction.
an extra force that increases the friction between two objects, ex. tires on a wet road
Action-reaction principle
Newton's third law, stating that for every action there is an equal and opposite reaction
The force we feel due to mass and acceleration
what is weight?
Difference between balanced and unbalanced forces.
Balanced - Equal forces acting on an object in opposite directions
Unbalanced - Forces that produce a nonzero net force, which changes an object's motion
Distance, pressure, temperature, and speed are all _____ quantities.
What is Scalar?
Friction that acts on objects that are not moving
What is static friction?
Newton's First Law
an object at rest will stay at rest, an object that is moving will stay moving unless acted upon by an external force.
Define Mechanics, Kinematics, and Dynamics
Mechanics - study of motion
Kinematics - the study of how things move
Dynamics - The study of why things move
Fundamental Forces (there are four of them)
4 forces act throughout the universe. They include gravity, electromagnetic force, strong nuclear force, and weak nuclear force
the curved path of a projectile
what is trajectory?
friction that occurs when one solid surface slides over another
What is Sliding friction?
the total momentum of a system of objects does not change, as long as no outside forces are acting on that system