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71 Cards in this Set

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  • Back
hypothesis
an explanation that's based on prior scientific research or observation and can be tested
system
a set of particles or interacting components considered to be a distinct physical entity for the purpose of study
sig figs
digits in a measurement that are known with certainty plus the first digit that is uncertain
components of a vector
the projections of a vector along the axes of a coordinate system
acceleration
the rate at which veloctiy changes over time
frame of reference
system for specifying the precise location of objexts in space and time
average velocity
total displacement divided by time interval during which the displacement occured
vector
physical quantity that has both magnitude and a direction
free fall
motion of a body when only force due to gravity is acting on the body
model
a pattern, plan , representation, ordescription designed to show the structure of workings of an object, system or concept
instantaneous velocity
velocity of an object at some instant or at a specific point in the object's path
precision
the degree of exactness of a measurement
controlled experiment
experiment that tests only one factor at a time by using a comparison of a control group with an experimental group
displacement
the change in position of an object
scalar
a physical quantity that has magnitude but no direction
projectile motion
the curved path that an object follows when thrown, launched, or otherwise projected near the surface of the Earth
accuracy
description of how close a measurement is to the correct or accepted value of the quantity measured
resultant
vector that represents the sum of two or more vectors
potential energy
energy associated with an object because of the position, shape, or condition of the object
equilibrium
in physics, the state in which the net force on an object is zero
mechanical energy
sum of kinetic energy and all forms of potential energy
elastic potential energy
energy available for use when a deformed elastic object returns to its original configuration
force
action exerted on an object which may change the objects state of rest or motion; has magnitude and direction
work
change in objects energy
static friction
the force that resists the initiation of sliding motion between two surfaces that are in contact and at rest
coefficient of friction
ration of the force of fiction between two objects in contact to the normal force with which the objects press against each other
precision
the degree of exactness of a measurement
controlled experiment
experiment that tests only one factor at a time by using a comparison of a control group with an experimental group
displacement
the change in position of an object
scalar
a physical quantity that has magnitude but no direction
projectile motion
the curved path that an object follows when thrown, launched, or otherwise projected near the surface of the Earth
accuracy
description of how close a measurement is to the correct or accepted value of the quantity measured
resultant
vector that represents the sum of two or more vectors
potential energy
energy associated with an object because of the position, shape, or condition of the object
equilibrium
in physics, the state in which the net force on an object is zero
mechanical energy
sum of kinetic energy and all forms of potential energy
elastic potential energy
energy available for use when a deformed elastic object returns to its original configuration
foce
action exerted on an object which may change the objexts state of rest or motion; has magnitude and direction
work
change in objects energy
static friction
the force that resists the initiation of sliding motion between two surfaces that are in contact and at rest
coefficient of friction
ration of the force of fiction between two objects in contact to the normal force with which the objects press against each other
momentun
how hard it is to stop an object
net force
single forch whose external effects on a rigid body are the same as the effects of several actual forces acting in the body
kinetic energy
energy of an object that's due to the object's motion
power
a quantity tha tmeasures the rate at which work is done or energy is transformed
impulse
product of the force and the time over which the force acts on an object
normal force
force that acts on a surface in a direction perpendicular to the surface
inertia
the tendency of an object to resist being moved or,if the object is moving, to resist a change in speed or diretion
kinetic friction
force that opposes the movement of 2 surfaces that are in contact and are sliding over each other
mass
quantity of matter of an object
energy
indicates objects ability to change its surroundings
weight
force due to gravity on an objext
newton's 1st law
an object at rest stays at rest and an object in motion stays in motion unless acted upon
newton's 2nd law
F=ma
newton's 3rd law
if 2 objects interact the magnitude of the force exerted on object 1 by object 2 is equal to magnitude of force exerted on object 2 by object 1, and are opposite in direction
gravitational potential energy
potential energy stored in the gravitational fields of interacting bodies
momentun
how hard it is to stop an object
net force
single forch whose external effects on a rigid body are the same as the effects of several actual forces acting in the body
kinetic energy
energy of an object that's due to the object's motion
power
a quantity tha tmeasures the rate at which work is done or energy is transformed
impulse
product of the force and the time over which the force acts on an object
normal force
force that acts on a surface in a direction perpendicular to the surface
inertia
the tendency of an object to resist being moved or,if the object is moving, to resist a change in speed or diretion
kinetic friction
force that opposes the movement of 2 surfaces that are in contact and are sliding over each other
mass
quantity of matter of an object
energy
indicates objects ability to change its surroundings
weight
force due to gravity on an objext
newton's 1st law
an object at rest stays at rest and an object in motion stays in motion unless acted upon
newton's 2nd law
F=ma
newton's 3rd law
if 2 objects interact the magnitude of the force exerted on object 1 by object 2 is equal to magnitude of force exerted on object 2 by object 1, and are opposite in direction
gravitational potential energy
potential energy stored in the gravitational fields of interacting bodies