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34 Cards in this Set

  • Front
  • Back
Generalized mental image of objects
Qualities or attributes that are usually peculiar to an object--determine properties with senses
Refer to or think of, a given property in terms of another, more farmiliar object
Measurment Process
1. Comparing referent unit to property being described
2. Following procedure which specifies how comparision is made
3. Counting how many standard units describe property being considered
Controlled Experiement
Compares 2 situations that have all the influencing factors identical except 1
Control Group
Situation used as basis of comparision
Experimental Group
Other group
Experiemental Variable
Single influencing factor that is allowed to be different in experimental group
Scientific Law
Describes an important relationship that is observed in nature to occur consistently time after time--what happens in nature
Description of a theory or idea that accounts for all known properties
Braod, working hypothesis based on extensive experimental evidence--tells you why something happened
Measure of how fast you are moving

Speed = distance/ time
Describes the speed and direction of a moving object
Rate at which motion changed
1. Changing speed
2. Changing direction
3. Changing both speed and direction

Acceleration = change of velocity/ time elaspsed
Push or pull capable of changing the state of motion of an object
Net Force
Sum of all forces acting on an object
Fundamental Forces
- Cannot be explained in terms of any other force
- Responsible for everything that happens in the universe

1. Gravitational Forces
2. Electromagnetic Forces
3. Weak Nuclear Forces
4. Strong Nuclear Forces
Gravitational Forces
act between all objects in the universe
Electromanetic Forces
Responsible for structure of atoms, chemical change, electricity, and magnetism
Weak Nuclear Forces
Involved in certain nuclear reactions
Strong Nuclear Forces
- Involved in close-range holding of the nucleus together
- Stronger than gravitational and electromagnetic
Behavior of matter to persist in its state of motion
Free Fall
When objects fall towards Earth w/out considering air resistance; considers only gravity and neglects air resistance
Balanced and Unbalanced Forces
- Motion continues unchanged with out unbalanced forces
- retarding forces decrease speed
- boost increases speed
- sideways force changes direction
Types of Motion
1. Vertical Motion
2. Horizontal Motion
3. Combination of both vertical and horizontal motion
Projectile Motion
An object thrown into the air
Verticle Projectile
- Slows going up
- Stops at top
- Accelerates downward
- Gravity acts at all times
- Acceleration is independent of the object's motion
Horizontal Projectile
- Horizontal velocity remains the same
- Taken with vertical motion = curved path
Newton's First Law of Motion
- "The law of Inertia"
-An object in motion stays in motion, and an object at rest stays at rest
- Inertia resists any changes in motion
Newton's Second Law of Motion
- Forces cause acceleration--change in motion evidence of net force
- Accerleration of object is directly proportional to net force acting on it and inversely proportional to the mass of object
- More force--more accerleration
-More maa--less acceleration
- Quantitative measure of inertia
- Amount of matter
- Measured in kilograms
- Force of gravity acting on mass
- Measured in pounds and newtons
Newton's Third Law of Motion
- Source of force--other objects
-Relates force between objects
- For every action there is an equal and opposite reaction
Momentum (p)
- Important property of movement closely related to Newton's 2nd Law
- Includes effects of both motujon (velocity) and intertia (mass)
- P = mass x velocity
- P - mv