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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
