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# Unit 4 Force &Motion

TermDefinition
distance the length between two places
position the location of an object compared with things around it
motion a change in an object's position compared to fixed objects around it
speed how fast an object's position changes with time at any given moment
velocity a description of a moving object's speed and direction
acceleration a change in the velocity of an object over time positive (speeding up) or negative (slowing down, also known as deceleration)
force a push or pull exerted by one object on another, possibly causing a change in motion
contact force a force that is exerted only when objects are touching
noncontact force a force exerted when objects are not touching
net force the combination of all forces acting on an object
balanced forces forces that act together on an object without changing its motion
unbalanced forces forces that do not cancel each other out and that cause an object to change its motion
gravity the force of attraction among all objects
friction a force that opposes the motion of an object in contact with a surface
air resistance the force that opposes the motion of an object through a gas
elastic force a force exerted by a material when it is stretched or compressed
tension force a pulling force applied to an object that can make an object stretch
Newton's first law of motion a physical law stating that an object at rest tends to stay at rest and an object moving in a straight line at a constant speed tends to continue moving that way
Newton's second law of motion a physical law that states that an object's acceleration depends on the object's mass and the amount of net force applied to it
Newton's third law of motion a physical law that states that for every action there is an equal and opposite reaction
action force the initial push or pull of one object on another object
reaction force the push or pull of a second object back on the object that started the push or pull
inertia the tendency of a moving object to keep moving in a straight line
acceleration graph (speed/time graph) speed of an object is plotted on the vertical axis and time is plotted on the horizontal axis (pg 188)
speed graph (distance/time graph) distance of an object is plotted on the vertical axis and time is plotted on the horizontal axis
at rest no motion or movement (Internet)
constant speed rate of speed without any change in acceleration or direction (Internet)
direction the course or path on which something is moving or pointing (Internet)
constant motion any type of motion when either the distance traveled by the object is the same for each second, or the speed of the object changes by the same amount each second (Internet)
line graphs of (positive) acceleration line graph that compares acceleration of an object to the unit of time, upward line shows speeding up (Internet)
line graphs of constant speed (acceleration graph) on a line graph, the acceleration-time curve is a horizontal line
line graphs of (negative) acceleration/deceleration on a line graph, the acceleration-time curve slopes downward
compression force squeezing force that can be applied to an object to make it shrink back (elastic force)
normal force the equal and opposite force of gravity (push upward)
Created by: akguidry