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