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# Unit 2 Vocabulary

TermDefinition
Motion A change in an object's position relative to a reference point
Frame Of Referance A coordinate system in which the position of an object is measured
Relative Motion Motion as observed from or referred to some material system constituting a frame of referance
Position Location of an object in relation to a reference point
Distance Length of path taken to get from A to B
Displacement Distance and direction of an object’s change in position
Speed The distance an object travels per unit of time
Constant Speed When the speed of an object remains the same
Average Speed The total distance traveled by the object in a particular time interval
Instantaneous Speed Speed at any given point in time
Velocity The speed of an object in a given direction
Relative Velocity The velocity of an object with respect to another observer
Final Velocity The quantity that measures the speed and direction of a moving body after it has reached maximum acceleration
Acceleration Rate of change in velocity
Centripetal Acceleration Acceleration toward the center of a curved or circular path
Position-Time Graph The slope of the line on a position-time graph reveals useful information about the velocity of the object
Initial Velocity The velocity at which the motion starts
Velocity-Time Graph Reveals useful information about the acceleration of an object
Projectile Anything shot or thrown through the air
Trajectory The path followed by a projectile flying or an object moving under the action of given forces
Parabola A curve formed by the intersection of a cone with a plane parallel to a straight line in its surface
Momentum The product of the mass and velocity of an object
Force Push or pull (attempt to change the motion of an object)
Net Force The sum of all of the forces acting on an object
Balanced Forces Fnet = 0 (no change in motion)
Unbalanced Forces Fnet ≠ 0 (motion is changed)
Friction Force that opposes the sliding motion of two surfaces that are touching each other
Static Friction Prevents two objects from starting to slide past each other
Kinetic Friction Opposes the motion of two objects sliding past each other
Rolling Friction Keeps objects rolling over each other instead of sliding (special form of Fs)
Coefficient Of Friction Measure of the stickiness between two surfaces
Gravity An attractive force between any two objects that depends on the masses of the objects and the distance between them
Gravity Field Region of space around an object with gravitational force
Acceleration Due To Gravity Rate at which nearby objects accelerate toward a body
Mass Rate at which nearby objects accelerate toward a body
Weight State an object is in when gravity is the only force acting on it
Free Fall When her or his “apparent weight” is 0
Apparent Weightlessness Tendency of an object to resist a change in motion
Inertia An object moves at a constant velocity unless an unbalanced force acts on it
Newton's 1st Law Of Motion An object moves at a constant velocity unless an unbalanced force acts on it
Newton's 2nd Law Of Motion An object’s acceleration is in the same direction as the net force on the object and is equal to the net force exerted on it divided by the mass
Newton's 3rd Law Of Motion Every action has an equal and opposite reaction
Action-Reaction Forces Force is an interaction that can change an object’s movement
Air Resistance A force that is caused by air
Terminal Velocity Maximum speed an object will reach when falling through a substance like air
Centripetal Force Imaginary force pulling to the outside of a circular path
Law Of Conservation Of Momentum If no external forces act on a group of objects, their total momentum doesn’t change
Centrifugal Force An apparent force that acts outward on a body moving around a center
Created by: 26mccava

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