Unit 4 Flashcards
a push or pull exerted on an object that causes a change in motion; has both direction and magnitude and may be a contact or field force
force
a physical model that represents the forces acting on a system
free-body diagram
the vector sum of all the forces on an object
net force
states that an object at rest will remain at rest, and a moving object will continue moving in a straight line with a constant speed, if and only if the net force acting on that object is zero
Newton’s First Law
states that the acceleration of an object is proportional to the net force and inversely proportional to the mass of the object being accelerated
Newton’s Second Law
the tendency of an object to resist change
inertia
the force experienced by an object, resulting from all the forces acting on it, giving the object an acceleration
apparent weight
an object’s apparent weight of zero that results when there are no contact forces pushing up on the object
weightlessness
the force exerted by a fluid on an object moving through the fluid; depends on the objects motion and properties and the fluid’s properties
drag force
the constant velocity of an object that is reached when the drag force equals the force of gravity
terminal velocity
a pair of forces that are equal in strength but opposite in direction
interaction pair
states that all forces come in pairs and that the two forces in a pair act on different object ans are equal in strength but opposite in direction
Newton’s Third Law
the specific name for a force exerted by a rope or a string
tension
the perpendicular contact force exerted by a surface on another object
normal force
projections of the component vectors
components
