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# Phys. Science A - U1

### Newtons 1st law: inertia + motion

TermDefinition
Distance how far you have traveled between two positions. - always positive -it is scalar
Displacement change in position - straight line difference from start/end position -displacement =final position minus initial position - can be positive or negative - it is vector
Scalar quantity that only requires magnitude (how big)
Vector quantity that requires both magnitude (how big) and directions
Speed how fast something is moving. s= d/t -it is scalar
Velocity rate at which position changes. v= disp./t - it is vector
Newton’s First Law the law of inertia - an object at rest will stay at rest and an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force
Mass - a measure of the amount of matter an object contains - a measure of the amount of inertia an object has.
Inertia the resistance an object has to changes in its motion.
Force any push or pull (interaction) that can cause a change in motion
Net Force the combination of all of the forces on an object.
Balanced Force When the net force in both the horizontal and vertical directions is 0 N. These cause motion to remain unchanged.
Unbalanced Force When the net force in both the horizontal and vertical directions is not 0 N. These cause motion to change.
Gravitational Force /Weight (Fg) A non-contact force between two objects that is most apparent close to a large object, such as a planet(center of earth)
Applied Force (Fa) the support force exerted upon an object that is in contact with another stable object. It is in the direction of the push or pull.
Normal Force (Fn) A contact force that is exerted by a surface against an object that is pressing against the surface. It is perpendicular to the surface and present whenever atoms are being “crunched”.
Tension Force (Ft) Contact force exerted by a taut string, rope, or wire on an object . It is along the rope and present whenever a rope is taut.
Friction Force (Ff) the force exerted by a surface as an object moves across it or makes an effort to move across it. It is parallel to the surface in the direction opposite of the motion or attempted motion.
Air Resistance/Drag (Fd or Fair) a special type of frictional force that acts upon objects as they travel through the air/fluid. It is in the opposite direction of the motion of the object.
Spring (Elastic) Force (Fs) A contact force exerted on an object by a spring or elastic object when it is stretched or compressed . It is along the spring in a direction that would restore the spring/elastic material to its relaxed position.
Thrust (Fthrust) A contact force that is exerted in the opposite direction of an exhaust gas being expelled.
Created by: kenzie_erschen