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80 Cards in this Set
- Front
- Back
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The substance from which everything in the universe is made is called
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matter
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measure of how much matter is in an object
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mass
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wight changes with location but mass is __________.
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constant
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_____ is the measure of the pull of gravity.
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weight
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Weight is a measure of the
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pull of gravity
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Of the three basic states of matter, this one has a definite shape:
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solid
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fixed volume; fixed shape
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solid
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no fixed volume or shape
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liquid
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fixed volume; no fixed shape
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gas
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A single chemical which will not divide into any other simpler substance is:
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an element
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The smallest chemically bonded unit of a substance is a
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molecule
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A listing of the elements by atomic number is called the
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periodic table
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The mass of all atoms is compared to the
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carbon atom
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If an atom is found to have an atomic mass equal to 3 times greater than oxygen, what is it's element symbol?
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Ti
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What kind of an element is the element described in Problem 25? (Its atomic mass is 3 times that of oxygen
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metal
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the smallest particle of an element
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atom
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chemical elements that are located on the left side of the stairs on the Periodic Table
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metal
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elements of the last period at the bottom of the chart
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radioactive substances
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anything that takes up space and has mass
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matter
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a substance which consist of distinct atoms that are united chemically
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compound
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a method of comparing atomic weights to carbon
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relitave weight
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Clear; allows light to pass
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transparent
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a material that is only partially clear, that allows some light to enter; frosted glass
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translucent
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material that does not allow light to pass through it
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opaque
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The science which investigates the structure, composition and changes in matter is
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Chemistry
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The science which conducts research in the relationships of energy and matter is
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Physics
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The material from which all things are made is called
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matter
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The entire universe appears to be made from the same elements found on earth. T or F
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True
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curious property of light is that it behaves similar to _____
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waves
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Light can pass through a ______ and some solids.
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vacuum
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Which type of solid will cast a shadow
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opaque
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All the colors of the rainbow represent the entire electromagnetic spectrum. T or F
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False (only the primary colors)
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Visible light is a very (small or large) portion of the energy spectrum.
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small
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What do X-rays, cosmic rays, and ultra violet light have in common?
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all part of the invisible electromagnetic spectrum
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What happens to the speed of light when it enters a glass prism?
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It slows down, it bends, and it separates into colors.
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The bending of light when it passes from one medium to another is called:
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Refraction
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When did Sir Isaac Newton experiment with light?
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1600+
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Formed in the sky when light passes through a multitude of raindrops.
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rainbow
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The colors of an opaque object are the result of:
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reflected light
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A bowling ball appears black because:
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It's surfaces absorb all light.
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An opaque red ball reflects:
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only red
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If you aimed all the various colored spot lights at the actor on a stage, the combined light would appear to be:
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white
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distance between the bottom and top of the sound wave
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amplitude
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compress, to push close together, like air molecules that are compressed
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compression
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highness or lowness of a sound
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pitch
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thin or far apart (rare); the part of the sound wave where the molecules are far apart
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rarefaction
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256 vibrations per second
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middle C on the piano
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1/5 mile per second
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the speed of sound
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loudness of a sound
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amplitude
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sound travels through this medium faster than through air
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solids
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source of all sound
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vibrations
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Which part of the ear is the first to react to air vibrations?
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eardrum
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While looking out the window, you see lightning flash and then two seconds later, you hear the thunder. How far was the lightening from you? ____________
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2200 feet
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A tuba will usually produce a (low or high) pitched sound.
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low
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A tap on a crystal glass will usually produce a (low or high) pitched sound?
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high
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As the number of vibrations per second decrease, what will happen to the sound?
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pitch decreases
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unit for measuring the power of engines and motors
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horsepower
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rate or speed of doing work
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power
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product of force moving through a distance
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work
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push or pull on an object is defined as a_______
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force
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In the English system, force is measured as:
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lb.
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In order to accomplish work, an object must move (toward or away) from the direction of applied force.
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toward
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The units of work in the metric system are:
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newton-meter
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A force of 1000 pounds drags a truck 50 feet in 10 seconds.
How much work is accomplished? How much power was required? |
Work = 50, 000 ft-lbs
Power = 5000 ft-lbs/sec |
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A crane lifts an air conditioner weighing 800 Newtons up to the roof of a building in New York City. It took one minute to raise it 200 meters.
How much work was accomplished? How much power was required? |
Work =160,000 n-m
Power = 2667 n-m/sec |
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Two similar objects are moved by two bulldozers.
If the work accomplished by bulldozer #2 was three times greater than bulldozer #1 then: |
Bulldozer #2 had to move 3 times greater distance
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A rocket has a power output of 55,000 ft.-lbs./sec. while raising a small satellite into orbit. How many horsepower is the rocket engine
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100 H.P.
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A watt is a smaller unit than 1 horsepower. T or F
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true
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A "watt" is a standard unit of electrical work. T or F
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False
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A force that has resistance to motion
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friction
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A mechanical device, or arrangement of fixed and moving parts that people use to work
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Machine
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Machines do not reduce the amount of work required for a task. T or F
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True
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A machine is brought in to accomplish a task which requires 100 ft.-lbs. of work. the machine will require an input (greater or less) than 100 ft.-lbs.
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greater
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The resistance which opposes the motion of moving parts is called
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friction
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Sometimes, friction is useful in some applications. T or F
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True
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A machine will always increase the force required to complete a task. T or F
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False
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Work output
__________ >, <, = 1 Work input |
<
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How much work was done when 70 pounds were moved 10 feet? (700 ft-lbs or 7 ft-lbs)
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700 ft-lbs
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How much work was done when 7 newtons were moved 2 meters?
(14 n-m or 72 n-m) |
14 n-m
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The work principal for real machines states the work accomplished by a machine will always be (less or more) than the work needed to operate the machine.
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less
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