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Jul 16, 2015 · What was the reason to use kilograms to measure weight (e.g. body weight, market vegetables etc.) instead of using newtons in everyday life?
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- Units About Weight
It is in fact mass that is measured with the unit Kilogram...
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Why do we use kilograms instead of newtons to measure weight...
- Archimedes Principle and Specific Gravity
The balance can only measure the downward force exerted on...
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- The Difference Between Mass and Weight
- Units of Mass and Weight
- Mass vs Weight Activities
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There are several differences between mass and weight. Mass is an intrinsic property of matter. It doesn’t change depending on where you measure it. It is a scalar value, which means it has magnitude, but no direction associated with it. The mass of an object is never zero. You measure mass with an ordinary balance on Earth or an inertial balance i...
We measure weight in grams, kilograms, ounces, and pounds. Technically, grams (g) and kilograms (kg) are units of mass. The SI unit of force is the Newton (N), with a 1 kg mass having a force of 9.8 N on Earth. The US unit of force is the pound (lb), while the unit of mass is something called a slug. A pound is the force required to move a 1 slug m...
Weight in an Elevator
One simple activity to see the difference between mass and weight is weighing yourself in an elevator. A digital scale works best because it’s easier to see the change in weight as the elevator ascends (increasing acceleration, which adds to gravity) and descends (negative acceleration, which decreases the effect of gravity). For a classroom activity, first have students weigh themselves (or an object) on a scale and discuss whether the value they obtain is mass, weight, or whether it matters...
Measuring Weight With Rubber Bands
You can compare the weights of objects by hanging them from rubber bands. On Earth, gravity affects a heavier object more than a lighter one and stretches the rubber band further. Predict what will happen when heavy and light objects are suspended from rubber bands on the ISS. What shape will the rubber band take? Do you expect there to be a difference between the way the rubber band responds to a heavy object compared to a light object?
Mass Cars
The easiest way to explore mass on Earth is to conduct experiments that move horizontally rather than vertically. This is because objects can’t change their position from the effect of gravity. Build a “mass car” and use an air pump to accelerate the mass across rollers or a low-friction track. Change the mass of the car, make a prediction about how this will change how far the car rolls, and perform an experimentto test the hypothesis. You can graph the distance the car moves compared to its...
Galili, Igal (2001). “Weight versus Gravitational Force: Historical and Educational Perspectives.” International Journal of Science Education. 23(1): 1073-1093.Gat, Uri. (1988). “The Weight of Mass and the Mess of Weight.” Standardization of Technical Terminology: Principles and Practice. ASTM. 2: 45-48.Hodgman, Charles D., editor. (1961). Handbook of Chemistry and Physics(44th ed.). Chemical Rubber Co. 3480-3485.Knight, Randall Dewey (2004). Physics for Scientists and Engineers: a Strategic Approach. Pearson.Weight, like other forces, is measured in newtons. When one measures the weight of an object in an elevator, one is required to look at weight as the measure of the sum or difference of the acceleration of gravity and of the surface the object is resting on. Consider the following example, where the acceleration of an elevator is 4.2 m/s 2.
The weight of an object is measured in newtons rather than in kilograms. The formula 𝑊 = 𝑚 𝑔 can be rearranged to make 𝑔 the subject, giving 𝑔 = 𝑊 𝑚. We see from this that the SI unit of gravitational field strength is newtons per kilogram (N/kg).
Ammonium chloride is prepared commercially by combining ammonia (NH 3) with either hydrogen chloride (gas) or hydrochloric acid (water solution): [3] NH 3 + HCl → NH 4 Cl. Ammonium chloride occurs naturally in volcanic regions, forming on volcanic rocks near fume-releasing vents (fumaroles).
How does the weight of more massive objects compare to the weight of less massive objects? How is the weight of an object calculated? Are mass and weight the same thing?
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The weight of something depends on its mass and the gravitational field strength. Weight is measured in Newtons and mass is measured in kilograms. Weight is a force.
