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# Force and Motion

### unit terms and definitions

TermDefinition
Motion an object is in motion when its distance from another object is changing
Reference Point a place or object for comparison to determine if something is in motion
Instantaneous Speed the rate at which an object is moving at that point in time
Velocity speed of an object in a given direction
Line Graph used to show motion of objects
Slope the steepness of the line
Acceleration the rate at which velocity changes (refers to increasing, decreasing, or constant/changing speed)
Force a push or a pull
Newton the SI units used for force
Net Force all of the forces acting on an object at one time
Unbalanced Forces can cause an object to start, stop, or change direction
Balanced Forces equal forces acting in opposite directions
Friction the force that two forces exert on each other when they rub together
Static Friction friction that acts on objects that are not moving
Sliding Friction occurs when 2 solid surfaces slide over each other
Rolling Friction when an object roll over a surface
Fluid Friction when a solid object moves through a fluid
Gavity a force that pulls objects towards each other
Free Fall when an object falls the only force acting is gravity-unbalanced force causes acceleration
Terminal Velocity the greatest velocity a falling object reaches
Newton's 1st Law an object at rest will remain at rest, an object moving at constant velocity will continue moving at a constant velocity UNLESS it is acted upon by an unbalanced force
Inetria the tendency of an object at rest to resist a change in motion
Newton's 2nd Law acceleration depends on an objects mass and on the net force acting on an object
Newton's 3rd Law if one object exerts a force on another object then the second object exerts a force of equal strength in the opposite direction
Paired Forces for every action there is an equal and opposite reaction
Momentum the momentum of a moving object can be determined by multiplying its mass * its velocity
Law of Conservation of Momentum the total momentum of any group of objects remains the same(is conserved), unless outside forces act on an object
Centripetal Force a force that cause an object to move in a circular path, the faster an object is moving the farther it travels before it hits the ground
Created by: owlbewise13