Physics

External world

everything surrounding a system that exerts forces on it is the. . .

gravitational force

the attractive force that exist between all objects with mass is the. . .

Newton's 1st law

an object that is at rest will remain at rest, and an object that is moving will continue to move in a straight line with constant sped, if and only if the net force acting on the object is zero" this sentence is a statement of. . .

force

an action exerted on an object that causes a change in motion is an. . .

field force

a force that is exerted without contact is an. . .

interaction pair

two forces that are in opposite directions and have equal magnitudes are a. . .

tension

a force exerted by any segment of a rope or string on an adjoining segment is. . .

Net force

the vector sum of two or more force acting on an object is the. . .

equilibrium

the net force on an object in . . . is zero

drag force

a force exerted by a fluid on an object moving through the fluid is an. . . .

Newton's Second Law

the acceleration of a body is directly proportional to the net force on it and inversely proportional to its mass." this sentence is a statement of. . .

apparent weight

the force exerted on a scale by an object and other forces acting upon the object is the. . .

contact force

a force that acts on an object by touching it is .. . . .

Newton's third law

the two forces in an interactive pair act on different objects and are equal in magnitude and opposite in the direction." this sentence is a statement of. . .

Normal force

a perpendicular contact force exerted by a surface on another object is a. . .

system

a defined object or group of objects is a. . .

inertia

the tendency of any object to resist change in its motion is . . .

agent

the specific, identifiable cause of a force is the. . .

free-body diagram

in a. . ., a dot represents an object and arrows represent each force acting on it, with their tails on the dot and their points indicating the direction of the force

terminal velocity

the constant velocity that a falling object reaches when the drag force equals the force of gravity is its. . .

weightlessness

when an object's apparent weight is zero, the object is in a state of. . .

weight

name of gravitational force action on object

9.80 m/s^2

magnitude of acceleration due to gravity

g

symbol for the acceleration due to gravity

Fg

symbol for the force due to gravity

mg

expression for the weight of an object

Newton

Unit of force

Mass

property of an object that does not vary from location to location