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57 Cards in this Set

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Physics
The branch of Science concerned with the nature and properties of matter and energy. Includes mechanics, heat, light, sound, and electricity
Scientific Method
The process used in science that seeks to elvcidate and understand facts about the universe
Speed
Distance divided by time, measured in meters per second
Experimental Error
Inaccuraces in an experiment caused by design, exceution, or instrumentation
Frame of Reference
The set of points against which an object is compared to measure its motion
Velocity
Speed with direction (compare with Speed) A bird flying east at 5m/h describes motion accurately
Acceleration
A change in velocity (speed with direction) slowing down or speeding up
Free Fall
The motion of an object as it falls through the atmosphere and accelerates due to gravity
Motion in one dimension
the motion of an object as it moves along one planee of motion
linegraph
the visual representation of data used to see trends in numbers
drag
the frictional force acting against motion causd by air
force
any push or pull
weight
a force determined by mass of an object times gravity w=mg
net force
the total sum of forces acting on a given object
pressure
he amount of force per unit area, measured in pascals (newtons per square meter)
pascal
the amount of force per unit area, measured in pascals (newtons per square meter)
Fluid
any material that flows
vector
can describe:
velocity
acceleration
force
displacement
motion
Pascal's principle
the idea that force in a fluid is transferable to all parts of that fluid
Normal force
any force that acts perpendicular to the plane of motion
projectile motion
motion in two dimensions with movement upward/downward/side
kinetic frition
fiction that oscurs when an object is moving and acts opposite the direction of its motion
kinematics
the study of objects going through motion in one or two dimensions
inertia
an object's tendency to resit a change in velocity
law of inertia
newton's first law of motion which states that an object in motion or at rest will remain so unless acted upon by an un balanced force
mass
the amount of matter in a given object, measured in killograms or grams
SI unit
the system of measurement that uses the meter, liter, an kg as base units
newton (N)
the si unit for force ( a measurement of weight) eual to 1 kg m/s (squared)
newton's second law
the relationship between mass and force
weight
a force determined by mass of an object due to gravity w=mg
net force
the total sum foces acting on a given object
pressure
the amount of force per unit area, measured in pascals (N/m squared)
P=f/a
pascal
the unit of pressure 1N/M (squared)
fluid
anything that flows
terminal velocity
the maximum velocity reached by an object undergoing freefall as the result of wind resistance
friction
the force caused by the interaction of 2 surfaces as they pass each other
coeffincient of friction
the number associated with the interaction of two surfaces that determines fictional forces
terminal speed
the maximum speed reached by a falling object slowed by air resistance
newton's 3rd law
describes the effect of different objects on each other in terms of force
action force
a force of an object as it makes contact with another
vector
a normal and mathematical representation of magnitude and direction anociated with a phyical phenomenon
acceleration
the rate of change in velocity
law of conservation of momentum
in closed systems the momentum does not change
elastic collision
when two objects collide, causing them to separate after colliding -- momentum is conserved
momentum
p=mv
conserved
when a physical qantity does not change, but changes form or is transferred
energy
anything that can do work (force applied through a distance
work
forcexdistance, measured in N/m or Joules
Joules
the SI unit for energy equal to one newtonxonemeter
power
work per unit time, measured in J/S or Watts
power= work/time
kinetic energy
the energy that an object has as a result of its motion equal to 1/2mv (squared)
conservation of mechanical energy
in a closed system energy cannot be created or destroyed, only transferred from one form to another
conservation of mechanical energy equation
mghi + 1/2mvi (squared) = mghf + 1/2mvf (squared)
PE
massxgravityxheight
law of conservation of mechanical energy
in a closed system, energy cannot be created or destroyed
pedulum
a rotational device comprised of a mass on a string that oscilates as the result of gravity
machine
a device that is used to multiply force or change direction