keyterms Flashcards
(24 cards)
The state in which one objects distance from another is changing.
Motion
A place or object used for comparison to determine if something is in motion.
Reference Point
The distance the object travels per unit of time.
Speed
Over all rate of speed at which an object moves, calculated by dividing the total distance traveled by the total time.
Average Speed
Rate at which an object is moving at a given instant in time.
Instantaneous Speed
Speed in a given direction
Velocity
Steepness of a line on a graph.
Slope
Rate at which velocity changes.
Acceleration
A push or pull
A force
The combination of all forces acting on an object.
Net Force
Change direction, stop moving, start moving
Unbalanced Forces
Equal forces acting on one obj in opposite directions
Balanced forces
The force that pulls objects towards each other.
Gravity
When the only force acting on falling obj is gravity; obj accelerates as it falls
Freefall
Fluid friction experienced by an object falling through air
Air Resistance
The greatest velocity a falling obj reaches; reached when force of air= weight of obj
Terminal Velocity
Something that is thrown.
Projectile
Force that 2 surfaces exert on each other when they rub against each other.
Friction
The friction that acts on objects that aren’t moving.
Static Friction
Occurs when 2 solid surfaces slide over each other
Sliding Friction
Occurs when an object rolls across a surface.
Rolling Friction
Occurs when a solid object moves through a fluid.
Fluid Friction
The tendency of an object to resist a change in motion.
Thertia
A characteristic of a moving obj that’s related to its mass and velocity
Momentum
