science unit 3 force, motion, and energy

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