all the science stuff we learned so far
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What are the 5 steps of the scientific method? | problem, hypothesis, procedure, analysis, conclusion
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| What does motion mean? | when an object changes position relative to its ref. point
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| what does balanced force mean? | equal in size, opposite in direction
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| whats the net force? | resulting force after all forces have been added
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| Whats the dif. between mass and wieght? | mass is matter in body and weight is the gravitational pull on an object
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| what is newtons 2nd law of motion? | big things need big pushes, little things need little pushes
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| what are the 4 types of friction? | static, sliding and rolling, fluid
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| what does free fall mean? | only force acting on an object is gravity
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| whats a refernece point? | place or obj. used for comparison to determine if somethings in motion
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| whats inertia? | when an object resists to change in its motion
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| whats newtons first law of motion? | matter in motion tends to stay in motion unless acted upon by another force
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| whats newtons 3rd law of motion? | for every action theres an equal or opposite reaction
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| what are the 2 things that determine friction? | pressure and surface
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| whats air resistance? | a form of friction that slows down objects moving in air
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| whats pascals principle? | when a force is applied to a fluid in a closed container the pressure increases everywhere by the same amount
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| whats archimedes' principle? | buoyant force on an object is equal to the weight of the fluid displaced
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| whats the law of conservation of momentum? | the total momentum of objects that collide is the same before and after
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| what are the 6 simple machines? | pulley, wheel&axle, inclined plane, screw, wedge, lever
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| Whats the unit to measure pressure? | pascals
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| what causes objects to sink? | if the wieght of an object is greater than the buoyant force
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| what causes an object to float? | if the buoyant force is equal or greater than objects weight
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| What happens when you increase the area of where a force is applied? | pressure decreases
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| the pressure a fluid exerts is always what to the surface of the object? | perpendicular
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| What happens to the force when you put two feet down instead of one? | nothing
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| If your on both feet and then you stand on one foot, what happens? | pressure increases
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| Whats buoyancy? | upward force thats exerted by a fluid on any object in the fluid
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| whats density? | mass of an object divided by the volume
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| what are the 2 things that determine gravitational attraction? | mass and distance
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| Whats a lodestone? | magnetic rock that points N and S
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| What are ferromagnetic elements? | iron, nickel, cobalt
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| Whats an aurora? | lights caused by solarwinds hitting earths atmosphere
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| what are teslas? | what magnetic fields are measured in
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| What are the Van Allen Belts? | earths magnetic field region that reaches 25,000km
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| What is ferromagnetism? | elements that can be magnets
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| whats a magnetosphere? | region of earths magnetic field thats surrounded by suns solar wind
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| What are domains? | clusters of atoms that determine if objects are magnetic or not
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| What is Magnesia? | the place in GReece where magnetism was first discoverd
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| Whats voltage? | how much electrical potential is available
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| Whats resistance? | measure of how hard it is for electrons to flow through materials
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| What are parallel circuits? | electricity has 2 paths, one light doesnt work the rest still do
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| What happens in an open switch? | electricity doesnt flow
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| Whats a series circuit? | electricity has 1 path
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| Whats electricity? | the flow of moving electrons through material
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| what happens in a closed switch? | electricity flows
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| how are magnetic domains important for something to be magnetic? | they determine if objects are magnetic or not
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| Whats an unbalanced force>? | 2 or more forces acting on an oject making it move
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| Whats the free fall rate? | time your in the are; d=rt
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| whats a free falls velocity? | 9.8mps2
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| Why are objects neutral? | same # of positives and negatives
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| what are the 3 main parts of a battery? | positive terminal, negative terminal and moist paste
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| Where does the electricity from a battery come from? | the negative to positive
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| whats an input force? | force you apply
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| whats an output force? | the force the machine applies
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