A | B |
matter | anything that has mass and takes up space |
mass | a measure of how much matter and object contains |
weight | the downward pull on an object due to gravity |
volume | a measure of the space matter occupies |
atom | the smallest basic unit of matter |
molecule | two or more atoms bonded together |
element | a substance that contains only a single type of atom |
compound | a substance tha consists of of two or more different types of atoms bonded together |
mixture | a combination of different substances that remain the same individual substance |
states of matter | the different forms in which matter can exist |
solid | a substance that has a fixed volume and fixed shape |
liquid | a fixed volume but does not have a fixed shape |
gas | not fixed volume or shape |
position | the location of an object |
reference point | a location to which you can compare other locations |
motion | the change of position over time |
speed | a measure of how fast something moves or the distance it moves in a given amount of time |
velocity | a speed in a specific direction |
vector | a quantity that has both size and direction |
acceleration | the rate at which velocity changes with time |
gravity | the force that objects exert on each other because of their masses |
orbit | the elliptical path one body follows around another body due to the influence of ravity |
friction | a force that resists the motion between two surfaces in contact |
fluid | a substance that can flow easily |
air resistance | friction due to air |
pressure | a measure of how much force is acting on a certain area |
pascal | the unit for pressure |
bouyant force | the upward force on objects in fluid |
Boutnoulli's Principle | an increed in speed of the motion of a fluid decreases the pressure within the fluid |
Pascal's principle | when an outside pressure applied to any point to a fluid in a container that pressure is transmitted throught the fluid with equal strength |
Force | A push or pull; something that changes in motion of an object |
Net Force | The overall force acting on an object when all of the forces on it are combined |
Newton's First Law | A law that states that an objects at rest remains at rest, and objects in motion remains in motion with the same velocity, unless acted on by an unbalanced force. |
Inertia | The resistance of an object to change in the speed or the direction of its motion. |
Newton's second Law | A law that states that the acceleration of an object increases with increased force and decreases with increased. |
Centripetal Force | Any force that keeps an object moving in a circle. |
Newton's third Law | A law that states that every time one object exerts a force on another object, the second object exerts a force that is equal in size and opposite in direction back on the first object. |
work | the use of a force to move an object some distance |
Joule | the unit for work |
Kinetic energy | the energy of motion |
potential energy | stored energy |
mechanical energy | the energy possessed |
power | the rate at which you do work |
watt | the unit of measurement for power |
horsepower | the amount of work a horse can do in a minute |
work formula | force*distance |
gravitational potential energy formula | mass*gravitational acceleration*height |
Mechanical Energy formula | Kinetic energy + Potential energy |
kinetic energy formula | mass*velocity*velocity/2 |
power formula | work/time |
gravity | a force exerted by masses |
masses do what? | attract each other |
gravity does what? | keeps object in order |
Friction | a force tha topposes motion |
friction occurs when | surfaces slide against each other |
pressure | depends on force and area |