air resistance
the force that opposes the motion of objects moving through the air.
friction
a force that opposes the motion of one object moving past another.
force
any push or pull by one object or another.
position
the loaction of an object.
motion
a change in an object position over time.
thrust
the force that pushes somthing forward.
joules
unit for measuring work.
inertia
the tendency of a moving object to keep moving in a straight line or of any object to resist a change in motion
law of conservation of energy
the theory that states that energy may change form, but it cannot be created or destroyed.
kinetic energy
the energy of a moving object.
potential energy
energy stored in the position or the structure of an object.
work
the use of force to move an object a certain distance or change an object.
energy
the ability to perform work or change an object.
unbalanced forces
forces that dont cancel each other out and that causes an object to change its motions.
balanced forces
forces that act together on an object without changing its motion.
frame of reference
a group of objects from which a position of motion is measured.
speed
how fast an objects position changes with time at any given moment.
velocity
the speed and direction of a moving object.
acceleration
a change in velocity with respect to time.
momentum
the mass of an object mulipled by its velocity.
Units of force are?
newton (N) and pounds (lb)
an arrow can be used to represent the blank and blank of force
direction and strength
three forces that act on airplane
thrust, lift, and drag
the force thay pulls all objects together is called
gravity
the amount of friction depends on what two factors
the roughness of the surface and how much force is used to push the two objects together
when is heat created
whenever there is friction
according to this law and object at rest tends to stay at rest and object in constant motion stays in motion unless acted upon by unbalanced force
law of inertia
balanced forces often point in opposite directions and they always add up to ?
zero
unbalanced forces cause an object to do what?
change its motion
increased force on an object causes its what to increase as long as the objects mass remains the same?
acceleration
an objects acceleration decreases or increases as its its mass increases if the force applied to object remains same
decreases
motion has two parts
distance and direction
distance can be measured in what?
meterrs,kilometer, feet, or miles
to measure direction you can use?
units of degrees and compass
You need this from which to measure position or motion
frame of reference
what do you need to calculate speed
divide the distance travelled by the time spend travelling
units of speed can be measured by
meters per second or miles per hour
to state the velocity in an object
direction and speed
any change in the veloctiy of an object over time
acceleration
if the speed of a car travelling south is increasing five miles per second every second its acceleration is
5 miles per second square south
an objects mass mletiplied by its velocity is
momentum
an object with a mass of one kilogram and a veloctiy of 10 miles per second has momentum of
10 kg m/s
the more of this an object has the greater its inertia
mass
Work done on an object changes the amount of blank that the object has
energy
energy is measure in units called
newton-meters
a stretching spring has this type of energy
potential energy
lifting a ball increases its blank energy
potential
chemical energy, elastic energy, and gratitational energy are different froms of blank energy
potential energy
heat, electricity, sound, and light are different froms of blank energy
kinetic
energy cannot be blank or blank, it can only blank
created or destroyed, it can change form
whenevery energy is used to do work, energy blanks
changes form
the amount of kinetic energy and object has depends on the object's blank
velocity
electricity does work in an oven by moving particles around and chnging into blank
heat