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wh 6th science exam
Mrs. wilson's exam for 6th grade at wilson hall study guide
| Question | Answer |
|---|---|
| What's earth's revoilution | 30km/s |
| _____ is always used in science | metric |
| measures work | joule |
| a unit is eather ____, _____, or ______ | meter liter gram |
| change | convert |
| the distance the object travels in one unit of time | speed |
| what is the formula for speed | speed = ___distance___ time |
| means a steady pace | constant speed |
| speed and direction of an object | velocity |
| ___ _____ ________ must keep very close tracksof the velocity of air craft | air traffic controler |
| have the most stressful job | air traffic controler |
| the hard outer layer of the earth | lithosphere |
| dividing line | boundary |
| a push or pull | force |
| the overall force on an object after all the forces are added together | net force |
| equal forces acting on one object in oppisite directions | balanced forces |
| every object resist any change to its motion, the resistance is called _____ | inertia |
| the (SI) unit of mass is the ________ | kilogram |
| the amount of matter in an object | mass |
| the kind of stuff that all objects are made out of | matter |
| state newton's first law of motion | an object at rest will remain at rest and an object that is moving at a constant speed will continue moving at a constant speed unless acted upon by an unbalanced force |
| one ______ equal the force required to accelerate one kilogram of mass at 1 meter per second per second | newton |
| 1 kilogram weighs about ____ | 2.2 pounds |
| 1 kilometer equals ______ | .6 miles |
| a force that pulls down | gravity |
| forces working in oppostite directions | friction |
| a force that causes an obeject to move in a circle | centripetal force |
| any object that travels around another in space | satellite |
| the mass of a substancecontained in a unit of volume | density |
| a substance that can easily change shape | fluid |
| the ability to do work on an object | energy |
| name 3 types of friction | sliding, rolling, and fluid |
| two solid surfaces that slide over each other ; this creates most friction | sliding friction |
| friction that occurs when an object rolls over a surface | rolling friction |
| creates the least amount of friction | fluid friction |
| when the only force acting on a falling object is gravity | freefall |
| state newton's third law of motion | if one object exerts a force on another object then the second object exerts a force of equal strength in the opposite direction on the first object |
| an object that is thrown | projectile |
| state newton's 2nd law of motion | for every action there is an equal and opposite reaction |
| moving away from the center , force pushing an object outward away from the center | centrifugal force |
| the rate at which work is done | power |
| the larger the acre results in ____ downward pressure | less |
| air pressure at sea level is about ______ | 10.bn/cm2 |
| at higher elevations there is ___ air above you | less |
| a break in the earth's crust where slabs of rock slip past each other | fault |
| gas trap | bubble |
| cave | cavity |
| upside down wing | spoiler |
| same bone structure but different function | homogenous structure |
| pencil lead | graphite |
| why does water expand when frozen | cause it forms a crystal |
| ______ is less dense than air | helium |
| _____ is less dense than water | ice |
| ______ have to travel faster than earth for orbit | satellites |
| the titanic departed from_____ in _______ | england 1912 |
| takes place of | displace |
| put under water | submerge |
| weight = _______ | gravity |
| front of the boat | bow |
| back of the boat | stern |
| change | convert |
| what was wright brother's goal | to fly a plane heavier than air |
| where did they test their odd vechile | a deserted beach in kitty hawk north carolina |
| is a device with which you and do work in a way that is easier or more efficient | machine |
| what is the formula for work | F times D |
| the force you exert on a machine | input force |
| the force exerted by the machine | output force |
| is the output force a machine gives you to make work easier | mechanical advantage |
| compare the input work to the output work | efficiency of a machine |
| a machine who has an efficiency of ____ loses very little work | 95% |
| an ideal machine would have efficiency of ___ | 100% |
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