| A | B |
|---|
| a separation between 2 positions | Distance |
| a change in the position of an object | motion |
| how fast an object moves | speed |
| ratios between 2 different quanities | rates |
| it is the rate of change of the position of an object | speed |
| to find the rate of speed use this | speed= distance/ time |
| the rate of motion at a given moment | instantaneous speed |
| the total distance traveled divided by the total time | average speed |
| to find the average speed.... | avg. speed= total distance/ total time |
| speed that does not vary | constant speed |
| the Earth's surface is constantly __________. | moving |
| 250 million years ago all continents formed one super continent called_________. | Pangaea |
| Australia is moving north at about __________ per year | 17 cm |
| The san andreas fault in CA moves about _____a year | 2 cm |
| ________ all contenents formed one super continent called Pangaea. | 250 million years ago |
| speed in a given direction | velocity |
| describes both the speed and the direction of a moving object | velocity |
| the rate of change of velocity | acceration |
| to find a change in ________ subract its initial veocty from its final velocity | velocity |
| it is described by its speed and direction | acceration |
| the amount if the accereration depends on both the change in velocity and _________ | time interval |
| the amount if time that passed while the change in velocity occurs | time interval |
| what will be large if velocity change is large ir if the time interval is small | acceration |
| on a graph an upward slope show increasing ______, a downward slope shows decreasing_______, and a horizontalk line shows no change in_______. | velocity |
| negative acceration is called___ | deceleration |
| to find average acceleration.... | avg.= final velocity- initial velocity / time it took for the velocity change |
| the greek letter that means " change in" | delta (traingle) |
| measured in meters/second / seconds and written as m / s2 | acceleration |
| a push of pull one body exerts on another | force |
| 2 forces that are equal in size but opposite in force, there is no change in velocity | balances forces |
| a gives energy to an object, it can make it move, stop its moving, or cause it to change direction | force |
| occurs when 1 force is greater that the other | unbalanced forces |
| unbalanced force always has a ____ | net force |
| force that always changes the velocity of a body | net force |
| can change the speed, direction or both | net force |
| the property of a body that resists any changein velocity | inertia |
| the word inertia comes from the latin word "inters" meaning... | idle of lazy |
| a special case if motion with a velocity equal to 0 | rest |
| the _______ an object has is a measure of its inertia cuz the more mass a body has the greater its inertia | amount of mass |
| An object in motion will stay in motion unless a net force acts in it, and object at rest will stay ar rest unless a net force acts upon it | Newtons 1st law of motion |
| any squezzing, stretching, or bending of matter | force |
| the force that opposes the motion between 2 surfaces and the amount force pressing them together | friction |
| the amount of friction depends in the type of ______ and the amount ____pressing them together | surface ; force |
| friction will cause a moving object to | slow down & finally stop |
| friction that occurs when 2 solid odjects slide over one another | sliding friction |
| friction that occurs when objects wheels or ball bearing roll over a surface, reducing the sliding friction | rolling friction |
| friction caused by an object moving thruogh a fluid | fluid friction |
| fluid include | liquids and gases (like air) |
| lubricants such a greases or oil reduces friction by changing sliding friction to | fluid friction |
| force that every object exerts on every other object | gravity |
| 2 things the amount of gravity depends on... | size of objects & distance between objects |
| size of object | larger object exert more gravity |
| distance between objects | the greater the distance the less force gravity exerts |
| the measure if the force if gravity that the earth exerts on an object resting on its surface | weight |
| the more mass an objecy has the greater its weight because there is more _______ to pull on | gravity |
| tha amount of matter in an object | mass |
| mass is measured in... | grams and kilograms |
| weight is measured in... | newtons |
| 1 kg weights 9.8 N, so the pull of gravity is ... | 9.8 m/s2 |
| u weigh less on the moon due to less gravity | not less mass |
| ______use the principal of balance force | scales |
