how can mass be measured, i mean with all the other laws acting on it, can it be measured and how?
373613
try using a bathroom scale, measures gravity vs. mass quite accurately.
750315
Newton just claimed that was true.  We have made millions of measurements which support the theory.  But I know no way of proving it.  A separate question is whether inertial mass equals gravitational mass.  Again, all the measurements we've ever taken support the idea, but we know no way to prove it.
881707
Determining the mass is trivial: just weigh the block.  For the density, you will need to know the volume, which will require some measuring with a ruler.  Then divide the mass by the volume for your answer.
751657
In most labs in schools, you don't use a scale but a three beam balance to measure the mass of an object. If you want to make a scale that is very sensitive, just use the basic idea of a balance. Balances work by 'balancing' out the net torque about a fixed point. If you want it to be able to measure a very small mass, just increase the moment arm of the beam. This is done by making one side of the pivot position longer while holding the other side constant or making it shorter.\n\nTo understand this concept get a yardstick, or a ruler if you can't find a yardstick. Put your finger at about the halfway mark. You should be able to balance the yardstick on your finger. Now move your finger closer to one end. What happened? It no longer balanced. Why? Because there was more weight on one side of your finger than was on the other side. This caused a torque about the point where your finger was. In order to balance this force, you would need to place a weight on the other end that is equal to the difference in the weight.\n\nSo, all you need is a rod of known weight and something to pivot it on. Once you know the weight, and assuming it is uniformly distributed, you can figure out the how much each part of the rod weighs. Then you can figure out how much of the weight, or mass, is on either side of the pivot. Then just add known masses until you get a balance. Then you'll know how much your dust weighs.
563922
They don't. They calculate the MASS of a planet by carefully obseving it's behavior in the gravitational field of the sun or star it orbits, and by using Keppler's Laws of Planetary motion and Newton's Laws of motion.
789266
Of course, it really depends on what lengths, masses and time increments you are trying to measure and why.  The key is to have a foundation reference point with each measurement.  But here are some ideas:\n\nLength:  A piece of string or a piece of paper is good tool.  If you need to know exactly how many feet something is, a common record album is 12 inches across ( 1 foot) or a standard floor tile which is 12 inches from one flat side to its' opposite.  Use this as your foundation length of your string.  For long distance you can guage the length of your footstep using the above method, then count your footsteps when walking constistently, or use the odometer in your car.  Not a precise technique but approximate.\n\nMass:  A bucket filled to the top with water, placed inside another bucket that can catch spilled water.  Let's say you want to find the mass of a bowling ball.  Simply place the bowling ball into the bucket filled to the top with water, and whatever water it displaces (and is caught in the second bucket), is its mass (example: 1 gallon).  Repeat these steps to find out the mass of other things like your dog.  It's not an exact science but it's a basis for comparison at home as long as you keep using the same buckets.\n\nTime:   The sun is always good for this since our clocks are based on exposure to it due to rotation of the Earth every 24 hours, and our revolution around it once a year.  It's how sundials work.  You use a shadow.  You can mark the position of a shadow with a pen or a scratch, then observe (and mark) how the shadow has changed at a later moment.  When sunlight is not available, candles are good to observe the passage of time in a similar way as they burn and melt, as long as you keep using the same kinds of candles.
313078
That's a contradiction.  If it can be observed it can be measured in some way -- measuring is observing.
111372
mass is the amount of matter, weight is the force gravity exerts on an object. mass stays the same, but weight changes if you go to the moon etc.
57362
Weight is a unit measure of gravitational force.
313524
Mass is a property of some physical object that specifies the amount of matter and energy it contains. Be careful and don't confuse mass with weight -- an astronaut in orbit has no weight but his/her mass remains the same.
777450
Yes. First law defines inertia, namely inability of a mass to change its state whether at rest or in uniform motion unless acted upon by an external force. The measure of inertia is the mass of the body. That is the first law.\nAs per the second law force=mass* acceleration,which takes place in the direction of force. Imagine a trivial case when force is zero. The acceleration has to be zero since the mass is never zero. In other words first law is a trivial case of second law when applied force is zero.
72896
Newtons is the unit for measure of force
458965
I don't know...his Three laws of Motion? Something about inertia that an object in motion must stay in motion until acted on by another force. Something like that.
149911
Density = Mass / Volume\nIf you know any 2 of the above quantities, you can find the other.
820356
mass = the amount of matter, independant of gravity and in sci units measure in kg's\n\nweight= force, the downward pull on an object due to gravity, measure in N (newtons)
43195
Physics, major science dealing with the fundamental constituents of the universe, the forces they exert on one another, and the effects of these forces. \n\nMeasurement, finding the size or amount of some quantity, and expressing it as a number of defined units.All measurement is based on a comparison. In general, the thing to be measured is compared with something that has already been calibrated, or measured against a known reference. However, a measurement is not complete unless it includes a statement of its uncertainty, or the confidence one can have in it.\nUnits of Weight and Measurement\nImperial System\nAMOUNT NAME \nAngular or Circular Measure \n60 seconds = 1 minute (min) \n60 minutes = 1 degree \n30 degrees = 1 zodiac sign \n57.2958 degrees = 1 radian \n90 degrees = 1 quadrant or right angle \n360 degrees = 1 circle \nCubic Measure (Volume) \n1,728 cubic inches (cu in) = 1 cubic foot (cu ft) \n27 cubic feet = 1 cubic yard (cu yd) \n231 cubic inches = 1 US gallon (gal) \n277.27 cubic inches = 1 British imperial gallon (i gal) \n2,150.42 cubic inches = 1 US bushel (bu) \n2,219.36 cubic inches = 1 British imperial bushel (i bu) \nDry Measure (Capacity) \n2 pints = 1 quart \n8 quarts = 1 peck (pk) \n4 pecks = 1 bushel \nLinear Measure (Length) \n1,000 mils = 1 inch (in) \n12 inches = 1 foot (ft) \n3 feet = 1 yard (yd) \n5.5 yards = 1 rod (rd) \n40 rods = 1 furlong (fur) \n8 furlongs = 1 mile (mi) \n5,280 feet = 1 mile \n3 miles = 1 league (l) \nLiquid Measure (Capacity) \n4 fluid ounces (fl oz) = 1 gill (gi) \n4 gills = 1 pint (pt) \n2 pints = 1 quart (qt) \n4 quarts = 1 gallon (gal) \nMariners’ Measure \n6 feet = 1 fathom (fath) \n120 fathoms = 1 cable’s length (US Navy) \n1,852 metres = 1 nautical mile (n mi) \n1 nautical mile per hour (n mph) = 1 knot (k) \nPaper Measure \n25 sheets = 1 quire (qr) \n20 quires = 1 standard ream (rm) \n516 sheets = 1 printers’ ream \n2 reams = 1 bundle (bdl) \n4 bundles = 1 case (c) \nPrinters’ Measure (Typography) \n0.013837 inches = 1 point \n12 points = 1 pica \nSquare Measure (Area) \n144 square inches (sq in) = 1 square foot (sq ft) \n9 square feet = 1 square yard (sq yd) \n30.25 square yards = 1 square rod (sq rd) \n160 square rods = 1 acre \n640 acres = 1 square mile (sq mi) \nSurveyors’ Measure \n7.92 inches = 1 link (li) \n66 feet = 1 chain \n80 chains = 1 mile \nWood Measure \n144 cubic inches (1' x 1' x 1'') = 1 board foot (bd ft) \n16 cubic feet (4' x 4' x 1') = 1 cord foot (cd ft) \n8 cord feet = 1 cord (cd) \nWEIGHTS \nWeight (Apothecaries’) \n20 grains = 1 scruple (s ap) \n3 scruples = 1 dram (dr ap) \n8 drams = 1 ounce (oz ap) \n12 ounces = 1 pound (lb ap) \nWeight (Avoirdupois) \n27.3438 grains = 1 dram (dr) \n16 drams = 1 ounce (oz) \n16 ounces = 1 pound (lb) \n14 pounds = 1 stone \n100 pounds = 1 hundredweight (cwt) \n8 stones = 1 long hundredweight \n(l cwt) \n2,000 pounds = 1 short ton (ST) \n2,240 pounds = 1 long ton (LT) or 20 (l cwt) \nWeight (Troy) \n24 grains = 1 pennyweight (dwt) \n20 pennyweights = 1 ounce (oz t) \n12 ounces = 1 pound (lb t) \n\nMiscellaneous Units\nWEIGHT/MEASURE UNITS \nAbsolute zero = -273.15o C (-459.67o F) \n1 atmosphere = 760 mm of mercury \n1 cup = 10 fluid ounces \n1 carat (international) = 200 milligrams (gem weight) \n1 megaton = 1,000,000 tons \n3 teaspoons = 1 tablespoon \n1 angstrom unit = 0.1 nanometre \n1 bolt of cloth = 40 yards \n1 gross = 12 dozen, or 144 \n1 light-year = 9.46 x 1012 km \n(5.88 x 1012 mi) \n1 tablespoon = 1/2 fluid ounce
69437
To measure the mass-energy of a region of space and say it's zero (with no uncertainty) you'd have to measure it for infinite time.  So if you only measure it for a finite time, you can only say the energy is less that a certain (non-zero) amount.  This is logically equivalent to saying that during that small time the energy could be any value between zero and that amount.  And there are actually measurements that reveal physical effects of this fluctuating energy, for example, the Casimir Effect.