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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