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Definition
| a object at rest remains at rest and an object in motion remains in motion |
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Definition
| the tendency of all objects to resist any change in motion |
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Definition
| change in position-- a reference point is needed |
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Term
| what 2 factors does gravitational attraction depend on? |
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Definition
| Size of the force depends on masses of the objects & the distance between them |
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Term
| what does archimedes principle state? |
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Definition
| that the bouyant force of an object in a fluid an upward force equal to the weight of the volume of fluid an upward force equal to the weight of the volume of fluid that the object displaces |
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Term
| what is bernoulli's principle? |
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Definition
| states that as the speed of a moving fluid increases its pressure decreases |
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Definition
| devices that use liquids to transmit pressure from one part to another |
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Term
| what is newtons second law of motion? |
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Definition
| the acceleration of an object depends on the mass of the object and the amount of force applied |
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Term
| what is newtons 3rd law?? |
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Definition
| Whenever on object exerts a force on a second object the second object exerts on equal and opposite force on the first |
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Term
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Definition
| the rate of change in velocity and there for occurs when and object in motion either |
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Term
| the speed of an object in a particular direction is? |
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Definition
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Term
| A force of attration between objects that is due to their masses is?? |
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Definition
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Term
| A measure of the gravitational force exerted on an object usually by the earth is ?? |
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Definition
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Term
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Definition
| a push or a pull; all forces have both size and direction |
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Term
| Amount of force exerted on a given area is?? |
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Definition
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Term
| pressure caused by weight of the atmosphere is?/ |
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Definition
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Term
| what occurs when a force causes an object to move in the direction of the force |
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Definition
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Term
| The work you can do on a machine is?/ |
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Definition
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Term
| The work done by the machine |
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Definition
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Term
| Tells how many times a machine multiplies force |
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Definition
Mechanical advantage
Ex. hammer |
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Term
| A comparison of a machine's work out put with the work input |
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Definition
mechanical efficency
ex;pulley |
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Term
| What are the 6 simple machines |
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Definition
| inclined plane, wedge, screw, lever, wheel & axle, pulley |
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Term
| what is an inclined plane and what are the examples of it?/ |
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Definition
slanted surface; objects can be pushed up to the inclined plane with less force than picking it up, but the distance is greater than just picking it up. MA=length of inclined plane//height of Inclined plane
MA is always >1 Ex. ramp |
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Term
| what is a wedge and examples of a wedge? |
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Definition
two inclined planes that move
MA=Length of wedge/ Greatest thickness
Ex. Knifes, axes |
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Term
| what is the screw and ex. |
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Definition
*inclined planed wrapped around a cylinder
*the threads are the spiral path on a screw
*Pitch the # of threads in a given length
*The closer the threads & the larger the threads the greater the MA |
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Term
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Definition
| A bar that pivots at a fixed point |
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Term
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Definition
*basically 2 wheels of different sizes
*a lever that moves in a circular path
*MA= radius of wheel/radius of axle
MA>1 Ex. Doorknob and all transportation |
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Term
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Definition
*wheel with a chain or rope
* 2 types see p 203 for pix fixed & move
*black & tackle-a combination of fixed & movable pulleys
* MA= # of supporting ropes
* MA= Fr/Fe |
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Term
| Substances that conduct thermal energy very well are |
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Definition
conductors
Ex. curling irons , Iron skillet cookie sheet , copper pipes, stove coils |
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Term
| Substances that do not conduct thermal energy very well are |
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Definition
insulaters
Ex. flannel shirt , oven mitt, and plastic spatula |
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Term
| what is electrical current? |
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Definition
| used to provide electrical energy |
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Term
| what is potential difference? |
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Definition
| the difference in energy per unit charge as a charge moves between 2 points passed a path of current |
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Term
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Definition
| is the opposition to the flow of electric charge. |
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Term
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Definition
| current= voltage/resistance |
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Term
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Definition
| rate at which work is done |
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Term
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Definition
| device that useses electromagnetic induction to convert kinetic energy into electrical energy |
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Term
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Definition
| a Device that increase or decreases the voltage of alternating current |
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Term
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Definition
| contains liquid electrolytes. Ex. they are particles in a car battery |
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Term
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Definition
contain electrolytes that are solid or paste like
Ex.is batteries |
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Term
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Definition
| contains a thin striip of metal through which the chargesfor a circuit flow |
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Term
| what is a circuit breaker |
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Definition
| is a switch that automatically opens if the current in the circuit is too high |
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Term
| what is parallel circuits |
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Definition
| a circuit in which all parts are connected in a single loop |
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Term
| what is a series circuit? |
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Definition
| a circuit in which all parts are connected in a single loop |
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Term
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Definition
| occurs when a wave bounce back after striking a barrier |
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Term
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Definition
| the bending of a wave as it passes at an angle from one medium to another |
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Term
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Definition
| bend of waves around a barrier or through an opening |
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Term
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Definition
| a substance through which a wave can travels particles do not travel with the wave |
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Term
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Definition
| waves in which the particles vibrate with an up and down motion |
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Term
| what is electomagnetic waves |
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Definition
| waves that do not require a medium |
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Term
| What is longitudinal waves? |
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Definition
| particles of the medium vibrate back & forth along the path that wave travels |
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Term
| What is a doppler effect? |
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Definition
| the apparent change in the frequency of a sound caused by the motion of either listen on the source of sound |
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Term
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Definition
| a type of electonic echolocation |
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Term
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Definition
| the # of waves produced in a given amount of time |
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Term
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Definition
| how high or low sound is percived to be |
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Term
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Definition
| how loud or soft sound is percieved to be |
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Term
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Definition
| the maximum distance a wave vibrates from its rest position |
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Term
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Definition
| most common unit use to express loudness |
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Term
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Definition
| something in which light passes through |
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