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# AP Physics 1

### Vocabulary Chpater 4

TermDefinition
Coefficient of friction A ratio between the force needed to overcome sliding friction and the object's normal force pressing it to the surface.
Coefficient of kinetic friction ( μk) The ratio of the force of kinetic friction exerted on an object to the normal force acting upon it: μk=Ff/FN
Concurrent Forces Two or more forces that are acting on the same object.
Dynamics The area of physics that deals with the relationship between the forces acting upon an object and its resulting motion.
Equilibrant A force that is equal in magnitude but opposite in direction to the resultant force.
Friction A force that opposes motion as a result of contact between surfaces. >Static friction is the force that must be overcome in order to start an object moving. >Kinetic friction is the force that must be overcome in order to keep an object moving.
Inertia The resistance of matter to change its motion. >Mass is a measure of inertia. >The SI unit of mass is the kilogram ,kg.
Kinetic (sliding) Friction The frictional force that must be overcome to keep an object in motion, for example, when one object slides against another.
Net Force The vector sum of all concurrent forces acting on a body; an unbalanced force. >If the net force is nonzero, the object experiences an acceleration.
Newton(N) The SI unit of force. One newton is the amount of force needed to accelerate mass of one kilogram by one meter/second squared: 1N 1kg*m/s^2
Newton's First Law of Motion AN object remains at rest or in a state of uniform motion unless acted upon by an unbalanced force (a net force); also called the Law of Inertia.
Newton's Laws Isaac Newton's three laws of motion: Inertia, Acceleration and Mass and Forces occur in pairs (action-reaction).
Newton's Second Law of Motion An unbalanced force (net force) acting on an object causes an acceleration which is directly proportional to the magnitude of the force, and which acts in the same direction as the force: F=ma.
Newton's Third Law of Motion If one object exerts a force on a second object, the second exerts a force on the first that is equal in magnitude and opposite in direction; also referred to as action-reaction.
Normal Force The force perpendicular to two surfaces in contact with each other which holds the surfaces together. > On a horizontal surface, the magnitude of the normal force equals the weight of the object.
Rolling Friction The friction that occurs when one object is rolled over another.
Static Equilibrium A state in which no net force (unbalanced force) acts upon an objects static equilibrium, so that the object remains at rest or moves with a constant velocity.
Unbalanced Force The sum total or net force on an object that produces acceleration of the object.
Universal Gravitation Newton's Law that explains that the net force of attraction between any two masses is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Weight Thee weight of an object is the gravitational force exerted on it.
Equilibrium A condition in which there are no unbalanced forces acting on an object.
Force A push or pull that affects the state of motion of an object. F=ma
Created by: BMcCormack