# Shared Flashcard Set

## Details

Unit 2/Lesson 2: Forces
Physics terms from Lesson 2
18
Physics
01/11/2012

Term
 Secret Number:
Definition
 Q9637Z9A
Term
 Gravity
Definition
 2 word: attractive forceAn attractive force that exists between ALL objects that have mass.
Term
 Law of Universal Gravitation
Definition
 2 word: mass & distanceAll objects are attracted to each other (gravity) with a force that depends on their mass and distance between them.
Term
 Weight
Definition
 2 word: gravity exertedA property of an object due to the gravitational force exerted on it.
Term
 Mass
Definition
 2 word: number (of) atomsThe number of atoms (matter) that make up any object.
Term
 Mass and Weight
Definition
 They are independent qualities of any object. Weight is the product of an object's mass within a gravitational field. Mass + Gravity = Weight
Term
 Friction
Definition
 2 word: opposes movementThe force that opposes the movement of two surfaces in contact with each other.
Term
 Static Friction
Definition
 2 word: not movingWhen the friction between two surfaces in contact is great enough…to keep them from moving…when a force is applied.
Term
 Sliding Friction
Definition
 2 word: moving frictionWhen the force applied to an object is larger than the maximum static force, the object will move.
Term
 Balanced Forces
Definition
 2 word: equal unmovingWhen 2 or more equal forces are applied to an object in opposite directions. The object will NOT move.
Term
 UNbalanced Forces
Definition
 2 word: object movesWhen 1 or more forces are applied to an object and they are unequal. The object WILL move, change speed, or change direction.
Term
 Newton's 1st Law of Motion
Definition
 An object will remain at rest…or will remain moving at a constant speed…unless it is acted upon by an unbalanced force.
Term
 Inertia
Definition
 The resistance to a change in motion.
Term
 Sir Isaac Newton
Definition
 An English scientist who first wrote about gravity, forces, and the motion of objects in 1688.
Term
 Variables that affect friction:
Definition
 2 words: texture weightAmount of friction force = the nature/TEXTURE of each surface and the WEIGHT/pressure between each object.
Term
 Elastic Force
Definition
 2 word: stretch compressA force exerted by a material when it is stretched (tension) OR compressed.
Term
 Tension Force
Definition
 2 word: pulling stretchingAn Elastic Force where a pulling force is applied to an object to make the object stretch.
Term
 Compression Force
Definition
 2 word: squeezing forceAn Elastic Force applied to an object that makes it become smaller in size.
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