# Shared Flashcard Set

## Details

Forces MHS
Basic Concepts of Forces
23
Physics
12/14/2010

Term
 FORCE (definition)
Definition
 Interaction between two objects.
Term
 FORCE DIAGRAM (definition)
Definition
 Graphical representation used by physicist while analyzing the forces exerted on objects by other objects.
Term
 MASS
Definition
 Definition: Amount of matter in an object. Symbol: m Units: kilograms (kg)
Term
 GRAVITATIONAL CONSTANT
Definition
 Definition: Acceleration of an object due to the Force that Earth exerts on the object. Slope of the FEonO vs. Mass graph Always 9.8 m/s2 on Earth Symbol: g Units: m/s2
Term
 FORCE OF EARTH
Definition
 Definition: Force exerted by Earth on any object. Symbol: FEonO Direction: Always down towards the center of Earth Units: N (Newtons)
Term
 FORCE OF EARTH (math model)
Definition
 [image]
Term
 SPRING CONSTANT
Definition
 Definition: Force requiered to stretch a spring by one meter ( 1 m ) Slope of the FSonO vs. DL graph Symbol: k Units: N/m
Term
 ELONGATION
Definition
 Definition: How much a spring stretches or compresses beyond its relaxed length. Symbol: DL Units: meters (m)
Term
 FORCE OF THE SPRING
Definition
 Definition: Force exerted by a spring on any object. Symbol: FSonO Direction: Always in the direction of the spring. Units: N (Newtons)
Term
 FORCE OF THE SPRING (math model)
Definition
 [image]
Term
 NORMAL FORCE
Definition
 Definition: Force exerted by any surface that supports an object. Symbol: FN Direction: Always perpendicular to the surface (90° angle)  Units: N (Newtons)
Term
 TENSION FORCE
Definition
 Definition: Force exerted by any string, rope, thread, lasso, etc. Symbol: FT Direction: Always in the direction of the string. Units: N (Newtons)
Term
 WEIGHT (definition)
Definition
 Magnitude (number) of the Force that Earth exerts on an object.   Example: the mass of an apple is 0.5 kg.   FEonA = - 4.9 N Weight = 4.9 N
Term
 HEAVY (definition)
Definition
 How humans perceive the force of Earth on an objects.   An object with a big mass will feel heavier than an object with a small mass (it will feel lighter).
Term
 MASS vs. WEIGHT
Definition
 MASS is the amount of matter in an object (measured in kg).   WEIGHT is how much force Earth exerts on that mass (measured in N).
Term
 EQUILIBRIUM
Definition
 All forces are balanced   The objects moves with constant velocity (including v = 0 m/s)   The acceleration of the object is 0 m/s2
Term
 NET FORCE
Definition
 Definition: Sum of all objects exerted on an object. Symbol: SF Direction: Always in the direction of the unbalanced force Units: N (Newtons)
Term
 NEWTON'S FIRST LAW OF MOTION
Definition
 Unless an unbalanced force is exerted on an object. The object will continue moving with constant velocity.
Term
 NEWTON'S SECOND LAW OF MOTION
Definition
 The acceleration of an object is directly proportional to the acceleration of the object.    The acceleration of an object is inversely proportional to the mass of the object.       Newton’s second law is a cause/effect relationship because an unbalanced force will cause an acceleration (no the other way around).
Term
 NEWTON'S THIRD LAW OF MOTION
Definition
 When two objects interact, object A exerts a force on object B. In turn, object B exerts a force on object A.   These two forces are equal in magnitude, but opposite in direction.
Term
 COEFFICIENT OF KINETIC FRICTION
Definition
 Definition: Ratio between two forces FK & FN. Slope of the FK vs. FN graph Symbol: µK Units: (no units)
Term
 FORCE OF KINETIC FRICTION
Definition
 Definition: Force exerted by any surface that opposes the motion of the object. Symbol: FK Direction: Always parallel to the surface (0° angle) Units: N (Newtons)
Term
 FORCE OF KINETIC FRICTION (math model)
Definition
 [image]
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