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### 45 Cards in this Set

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 Define force What are the 2 forces Force is a push or a pull Push and Pull List and describe 3 types of friction (explain each) sliding--> two objects together fluid--> moving objects through liquid rolling--> stops objects from rolling on a surface rolling What is Universal Law of Gravitation Everything is attracted to bigger objects ( earth and sun) What are the 3 Newton's Laws of motion ? Law 1 : for objects to keep doing what they are doing Law 2: Force (n)=mass(kg)x Acceleration (m/s2) Law 3: States that every action there is an equal and opposite reaction. Using the 1st and 2nd law why is wearing a seat belt safe? because the seat belt hold us back when the car stop s in motion quickly and our bodies want to keep moving , so seat belts keep us from flying through the window. What is the equation for Force? Force(N) = Mass(kg)x Acceleration(m/s2) How is Mass different than weight ? Mass is different than weight because mass is measured in grams, kilograms ect. and weight is measured in Newtons(N) Weight is a force called gravity What is the equation used to calculate work? Work(J)=Force (N)x distance (d) What are the 6 Machines? 1. Screw 2. Incline Plane 3. Wedge 4. Lever 5. Wheel and axil 6. pulley 5 machine funtions are? 1. multiply speed or distance 2. can multiply force 3. machine transfers engery from one force to anther 4.machine can change force from one place to the next. 5. Change dirrection of force What is the equation to determine Power of a machine? Power (W)= Work (J) _______ Time (s) Define mechanical advantage is the amount by which a machine can multiply force What is the equation used to determine Mecanical advantage? MA=Load force -withoutmachine ---------- Effort force-with machine How do machines work eaisier? because they use less force Define efficency the work done by a machine The equation to calculate efficency WE=Work output-> your work ------------ Work input-> Machines work From closest to the sun name the order of the planets mercery, vennus, earth, mars, jupiter, saturn, uranus, enptune and pluto Which planets are terrestrial ? Mercury, venus, earth, mars Which planets are Gas giants? jupiter, saturn, uranus, netpune Which planet is neither a gas giant or a terrestral planet? Pluto Which planets (2) have to atmosphere? Mercury and pluto Which planets are earth like planets? Terrestrial Which planets are high in gravity and low density? Gas giants B.D Mercry ranges from -180 c - 400 c B.D Venus has warm surface caused by its thick atmosphere B.D Earth has oxygen B.D Mars appears reddish B.D Jupiter has more mass than all planets B.D Saturn over 1000 rings Uranus Rotates on its side B.D Nepune Has thin rings made up of dark dusty materials traveling around it B.D Pluto neither gas giant or terrestrial Describe the charateristics by which stars are described they seem to make patterns --consilations moat important star is the sun keeps us warm and we use it fro light What is a meteor? Rock that does not hit earth it burns up in earths atmosphere What is a meteorite? A rock that does not burn up it hits earth What are rocks that sone come into earths atomosphere? Asteroids What is absolute magnitude ? the acual amount of light energy given off by a staar at atandard distance What is apprent Magnitude? Brightness of a star how it appears to us Cycle of Low mass star? nebula->gas&dust spin->clumps->gravity holds-> light energy formed->star ->cools->swells-> Red giant -> gas flake-> white dwarf Cycle of a Med Mass star Nebula-> gas&dust spin-> clumps-> gravity holds-> light energy formed-> star-> red giant-> gas flakes off-> white dwarf Cycle of a Large mass star nebula-> gas and dust spin-> clumps-> gravity holds-> light energy formed-> star-> red giant-> super nova-> pulsar Cycle fo a very large star Nebula-> gas and dust spin-> clumps-> gravity hold-> light energy formed-> star-> super red giant-> super nova -> black hole Define Element pure substance that cannot be broken down into any other pure substance Define Compound Pure Substance made up of 2 or more elements that are chemically combined What is Physical Change is a change in matter in which no new substance can be produced-> can be revearsed