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# 0C-Force & Motion

### 0C Changes in Force and Motion

TermDefinition
accelerate a change in motion caused by an unbalanced force (speed up, slow down, start, stop, and turn)
balanced force forces in opposite direction with the same magnitude
direction a straight path that an object can travel
force a push or a pull
force arrow an arrow that indicates the size and direction of a force
formula for force force = mass x acceleration
Free-Body Diagram an illustration showing all of the forces acting on one object or system
friction the force that resists motion
static friction the resistance between two or more solid objects that are not moving relative to each other
sliding friction the resistance created by two objects sliding against each other
rolling friction the resistance from the motion when wheels are used on a surface
fluid friction the resistance from the movement of a body through a liquid or gas
inertia the tendency of an object to resist a change in motion
net force the sum of all forces acting on an object
Newton SI unit of force (N)
Newton's First Law an object at rest stays at rest, an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Newton's Second Law the amount of force needed to accelerate an object depends on the objectâ€™s mass. (force equals mass times acceleration (f = ma))
speed the distance an object travels per unit of time
unbalanced force forces that cause a change in motion
velocity speed in a given direction
applied force a force that is applied to an object by a person or another object
air resistance a force that is caused by pushing air
buoyancy the force exerted on an object that is wholly or partly immersed in a fluid
elastic force the force that allows some materials to return to its original shape after being stretched or compressed
friction force the resistance force exerted by a surface as an object moves across or through it
gravity a force that attracts any two objects with mass
magnetic force attraction or repulsion that arises between electrically charged particles
normal force the support force exerted upon an object that is in contact with another stable object
spring force the force exerted by a compressed or stretched spring
tension force a force developed in a rope, string, or cable when stretched under an applied force
F.app applied force
F.air air resistance
F.buo buoyancy
F.ela elastic force
F.fri friction force
F.grav gravity
F.mag magnetic force
F.nor normal force
F.spr spring force
F.ten tension force
F.sta static electricity
static electricity the atraction or repulsion between objects with electrical charges

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