# Shared Flashcard Set

## Details

Finals Semester 1
Study guides and test questions
97
Physics
12/14/2008

Term
 physics describes
Definition
 the organization of the universe
Term
 it builds understanding of __________ that govern the universe
Definition
 natural laws
Term
 allows _________ and ___________ of natural laws
Definition
 deduction, application
Term
 speed- the measure of hte _________ in a give amount of ________
Definition
 distance traveled, time
Term
 unites of speed
Definition
 m/s
Term
 v=
Definition
 dt
Term
 distance- how _____ an obeject in motion travels (in ___)
Definition
 far, meters
Term
 displacement the __________ of an object in motion from initial position to final position.
Definition
 change in position
Term
 velocity- change in _______ of an object over a __________
Definition
 displacement, time interval
Term
 constant speed- objects do not _____ or ____________. Objects cover _________ amount of distnaces each ___ interval.
Definition
 speed up, slow down, time
Term
 constant velocity- constant speed in ___________
Definition
 one direction
Term
 a graph shows how _________ are related with a picture
Definition
 two variables
Term
 independent variable- this is the variable that you as the experimenter are free to change. It is usually plotted on the ________ or the ___ axis. It is sometimes called the ____ variable.
Definition
 horizontal, x, manipulated
Term
 dependent variable- the value of this variable depends on changes in the independent variable. It is plotted on the __________ or _______ axis. IT is sometimes called the ___________.
Definition
 vertical, y, responding
Term
 to remember varibles:its all about HIMon VD you want R
Definition
 horizontal, independent, manipulatedvertical, dependent, responding
Term
 a graph can be used as a __ to make _______ based on the relationship between x and y variables.
Definition
 model, predictions
Term
 Graph Relationship:strong relationship between variables- this means that a _____ change in one variable causes a _______ change in another variable.
Definition
 big change, big change
Term
 Graph Relationship:no relationship between variables- a change in one variable has _______ effect on the other variable
Definition
 no detectable
Term
 Graph Relationship:weak relationship between variables- a big change in one variable has _____ effect on the other variable.
Definition
 little
Term
 Graph Relationship:inverse relationships- when one variable increases, the other variable ________.
Definition
 decreases
Term
 acceleration is the _ in the ______ of an object
Definition
 rate of change, speed
Term
 a "rate of change" means the ratio of ________ in one variable divided by how much ________ the change takes.
Definition
 change, time
Term
 units for acceleration are:
Definition
 m/s2
Term
 acceleration=
Definition
 change in speedchange in time
Term
 acceleration can be in the ____ direction as an object's speed or it can be in the ________ direction
Definition
 same, opposite
Term
 speed ________ when acceleration is the in the _____ direction adn _______ hwen acceleration is in the ___ direction as the speed.
Definition
 increases, samedecreases, opposite
Term
 when speed and acceleration have hte same sign, speed ______. when speed and acceleration have opposite signs, speed _______.
Definition
 increases, decreases.
Term
 an object has ______ acceleration if it is traveling at a constant speed in one direction.
Definition
 zero
Term
 constant acceleration means that speed changes by the ____ amount for every interval of time.
Definition
 same
Term
 an object can have _______ with zero speed
Definition
 acceleration.(ex. throwing a ball up into the air. it travels in one direction, slows down, stops, then stars traveling in the opposite direction.)
Term
 slope- rise/runacceleartion= ?/?
Definition
 speed/time
Term
 when the slope of the graph is steeper, that represents ____ acceleration.
Definition
 greater
Term
 a negative value for the slope indicates _______- acceleration.
Definition
 slower
Term
 from a speed vs. time graph, the area under the curve represents __________
Definition
 distance traveled.
Term
 free fall- an object is in free fall if it is falling due to the influence of ______ only.
Definition
 gravity
Term
 gravity on earth causes all objects to accelerate at the same rate _________ toward the _________.
Definition
 9.8 m/s2, earth
Term
 The accelration due to gravity is given the symbol _____
Definition
 g
Term
 all objects, regardless of whether they are large or small, fall at hte ______ in the absence of air resistance
Definition
 same rate
Term
 air resistance is a force exerted on objects moving through the air. You have felt this force if you have ever hung your arm out hte window of a moving car. Air resistance acts to ______ the speed of falling objects, but may be ignore for objects with a small surface area and large mass.
Definition
 slow down
Term
 the maximum speed with which an object falls through the air when limited by air resistance is ________.
Definition
 Terminal speed.
Term
 terminal speed depends on _____, ________, and ______.
Definition
 shape, size, weight
Term
 force- a ---- or a ---- on an object.
Definition
 push, pull
Term
 unit of force
Definition
 newton
Term
 force is a vector quantity- in other words it has magnitude and ________
Definition
 direction
Term
 new force- vector sum of all _____ acting on an _________
Definition
 forces, object
Term
 when all forces acting on an object are balanced, the object has _________.
Definition
 no change in motion
Term
 when all the forces acting on an object do not add up to zero, an object's motion will change- it will not move at a __________________________________ or stay ______________.
Definition
 constant velocity in a straight line, at rest
Term
 Newton's first law- an object ----- remains ----- and an object ----- remains ----- with a ----- velocity unless acted upon by a ---- external ---.
Definition
 at rest, at restin motion, in motion, constantnet, force
Term
 newtons first law is often referred to as the ________
Definition
 law of inertia
Term
 inertia is a property of an object's
Definition
 mass
Term
 inertia
Definition
 tendency of an object to resist changes in it's motion
Term
 large mass implies _____ inertia and ____ mass implies _______ inertia
Definition
 large, small, small
Term
 It does not take a ____ to keep an object moving. It takes a _____ to stop the object
Definition
 force, force
Term
 A .4 kg puck is moving horizontally across an air hockey table with a speed of 4 m/s. How much net force is require d to keep the puck moving at this speed and in this direction?
Definition
 zero
Term
 inertia is a property of
Definition
 mass
Term
 the unit of force, the ____, can be broken down to the units for mass and acceleration= 1 ____ = 1 kg/ms2
Definition
 newton, newton
Term
 the direction of the net force and the acceleration will be the
Definition
 same
Term
 zero acceleration would mean the net force is also zero and this state is called
Definition
 equilibrium
Term
 Free body diagrams- to determine whether an object will accelerate, we need to konw the _________. a diagran shows all the forces acting ON an object is called a free body diagram.
Definition
 net force
Term
 Newton's second law- the ------- of an object is ---- proportional to the net external force acting on the object and --------- proportional to the ----- of the object.
Definition
 acceleration, directly, indirectly, mass
Term
 Newton's third law- for every ---- there is an ----------
Definition
 action force, equal, opposite reaction force
Term
 action reaction forces always:occur in -----act on ------- -------
Definition
 occur in pairs,act on different objects
Term
 why dont action reaction pairs cancel each other out?
Definition
 they act on different objects.
Term
 a scalar quantity that can be completely described by one value- the ______-
Definition
 magnitude
Term
 examples of scalar quantities
Definition
 energy, temperature, time, pressure, distance, height, mass
Term
 vectors require -------- and ----- to completely describe the measurement.
Definition
 magnitude, direction
Term
 examples ofvectors
Definition
 weight, veloctiy, acceleration, momentum
Term
 to combine vectors use the ______ method
Definition
 tip to tail
Term
 projectile- something moving through teh _______ only onder the affect of _____-
Definition
 air, gravity
Term
 the path a projectile follows is called a -------. The equation that describes the path of a projectile forms a __----- shape.
Definition
 trajectory, parabolic.
Term
 teh magnitude of a velocity vector is the
Definition
 speed
Term
 once an object is travelling only under the influnece of gravity, the ----- motion and the ----- motions are ------ of each other.
Definition
 horizontal, vertical, independent
Term
 a projectile travels under the influence of gravity
Definition
 alone
Term
 range or horizontal distance depends on the ------- ------ and the ------- -------./
Definition
 launch angle, launch velocity
Term
 a launch angle of ----- degrees evenly divides the horizontal and vertical components of velocity and thus gives the ----- range
Definition
 forty five, longest
Term
 mass- the amount of ---- an object contains
Definition
 matter
Term
 unit of mass
Definition
 kilogram kg
Term
 does an objects mass vary with location?
Definition
 no
Term
 weight- the force of ----- acting on an object
Definition
 gravity
Term
 the strenght of gravity is not constant throughotu the universe. so, weight 0000 vary as location changes
Definition
 can
Term
 when is an object weightless?
Definition
 when no force of gravity is acting on you.
Term
 weightlessness can occur ==== or =====
Definition
 outerspace or free fall
Term
 when an object is in equilibrim, all the forces acting on the object 000000.
Definition
 are balanced
Term
 normal force- means -----
Definition
 perpendicular
Term
 normal force is perpendicular to the ---- on which an object is placed
Definition
 surface
Term
 frictional forces ----- or ----- motion.
Definition
 oppose, resist
Term
 friction results when a force is applied to an object in contact with a surface and is caused by ----- in the -----
Definition
 imperfections, two surfaces
Term
 friction depends on:mass of -------------- of two surfaces in contact
Definition
 object, roughness
Term
 the ---------------- is a measure of hte strength or kinetic friction between teh two surfaces
Definition
 coefficent of frition
Term
 it taks a certain amount of force to start an object moving but usually _____ to keep it moving
Definition
 less force
Term
 since friction ----- motion, it ----- the acceleration produced by the forces applied to the object.
Definition
 opposes, reduces
Term
 reducing friction- fricional forces are ------ but can be reduced
Definition
 unavoidable
Term
 lubricant is a ---- used to reduce friction. what is an example?
Definition
 liquid, adding oil to a car.
Term
 magnetic levitation- powerful magnets are used to lift an object so it can ride ona cushion of
Definition
 air
Term
 does equilibrium mean that no force is acting on the object?
Definition
 no, all forces are balanced
Term
 applications of equilibrium- once you identify the force acting on an object, knowing that the net force = _____ helps you solve for the unknown foce.
Definition
 zero
Term
 the foce always act in a ______ to return the spring to its --------- -----/
Definition
 in a direction, unstretched shape.
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