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Study stack for Physical Science Chapter 11 and 12

frame of reference- a system of objects that are not moving with respect to one another.
relative motion,- movement in relation to a frame of reference ex. people standing looking at train see people moving- people on train don't see self moving
distance, the length of a path between two points
vector a quantity that has magnitude and direction. Magnitude can be size, length, or amount
resultant vector the vector sum of two or more vectors
speed -- the ratio of the distance an object moves to the amount of time the object moves
average speed - is computed for the entire duration of a trip - average speed = total distance/total time
instantaneous speed is the rate at which an object is moving at a given moment in time ex. speedometer speed driving down the street
velocity, the speed and direction in which an object is moving
acceleration, as changes in speed, changes in direction, or changes in both.
free fall, the movement of an object toward Earth solely because of gravity.
constant acceleration, The velocity of an object moving in a straight line changes at a constant rate when the object is experiencing constant acceleration.
Force a push or a pull that acts on an object
Newton the force that causes a 1-kilogram mass to accelerate at a rate of 1 meter per second each second
Net Force the overall force acting on an object after all the forces are combined.
Friction a force that opposes the motion of objects that touch as they move past each other.
Static Friction is the friction force that acts on objects that are not moving.
Sliding Friction a force that opposes the direction of motion of an object as it slides over a surface.
Rolling Friction the friction force that acts on rolling objects
Fluid Friction opposes the motion of an object through a fluid
Air Resistance Fluid friction acting on an object moving through the air
Gravity a force that acts between any two masses. Gravity is an attractive force, that is, it pulls objects together
terminal velocity the constant velocity of a falling object when the force of air resistance equals the force of gravity.
projectile motion the motion of a falling object (projectile) after it is given an initial forward velocity. Air resistance and gravity are the only forces acting on a projectile.
Inertia the tendency of an object to resist a change in its motion.
Mass is a measure of the inertia of an object and depends on the amount of matter the object contains.
Weight is the force of gravity acting on an object
Momentum the product of an object's mass and its velocity.
Created by: gilcherdonna