Weight Difference
Weight Difference - Related Videos
07:30
Just-noticeable Differences
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Psychophysics is a branch of psychology and neuroscience that tries to explain how physical quantities are translated into neural firing and mental representations of magnitude. One set of questions in this area pertains to just-noticeable differences (JND): How much does something need to change in order for the change to be perceivable? To pump intuitions about this, consider the fact that small children grow at an enormous...
00:57
Weighted Mean
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2023
While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others. For example, consider the number of goals scored in the matches of a tournament. While computing the average number of goals scored in the tournament, it may be more important to...
01:09
Apparent Weight
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2023
True weight is the measure of the gravitational force acting on an object. However, if the object accelerates, its measured weight is different from its true weight. Similar observations can be made when the object is submerged in water. An object's weight in water is its apparent weight, which is equal to the difference between its true weight and the buoyant forces. Consider a person standing on a bathroom scale inside an elevator. If the scale is accurate at rest, its reading equals the...
01:19
Mass and Weight
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2023
Mass and weight are often used interchangeably in everyday conversation. For example, medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the acceleration due to...
01:16
Electric Potential and Potential Difference
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2023
Suppose a positive test charge moves away from a positive static charge, then the Coulomb force does positive work, and its electric potential energy decreases. The potential energy per unit charge is defined as the electric potential. The electric potential is independent of the test charge. When a test charge moves from the initial to the final position, the electric potential difference between those positions is defined as the ratio of the change in the potential energy to the charge on the...
FAQs
For an object with unchanged mass, calculate each weight with W = mg and subtract the results: ΔW = m(g₂ − g₁). Because the mass is common to both measurements, the difference depends on the change in local gravitational acceleration. This relationship lets physicists compare gravitational conditions without treating the object itself as having changed.
Gravitational acceleration can vary from one position to another within a gravitational field. Applying W = mg at each position therefore produces different force values even when the object’s mass remains constant. This principle is useful when interpreting measurements made at different locations and when analyzing gravitational experiments that compare positions rather than only planets.
An accelerating frame can produce a change in the weight an observer appears to measure, even when the object’s mass has not changed. Elevator motion provides a familiar example of this effect. Separating the gravitational force from the apparent measurement is important when analyzing motion in accelerating systems, because the reading reflects the frame’s conditions as well as gravity.
Researchers keep the object’s mass fixed, identify the local gravitational acceleration for each location, and apply W = mg separately. Comparing the calculated values reveals how the gravitational environments differ. The result demonstrates that a single object can produce different weight measurements across worlds while retaining the same mass, making location a central variable in the comparison.
Balance measurements can reveal changes in the force associated with an object when gravitational conditions differ. Interpreting such readings requires accounting for the local value of gravitational acceleration rather than assuming that a change in weight means a change in mass. This distinction helps physicists use balances consistently in comparisons involving different locations or gravitational settings.
Buoyancy analysis can involve comparing the forces measured for an object under different conditions. Weight difference provides the gravitational-force framework needed to interpret those measurements, while the object’s mass remains a separate quantity. Using W = mg helps identify how much of an observed variation relates to gravity and supports clearer analysis of force changes.
Elevator experiments place an object in an accelerating frame and examine how its apparent weight changes during motion. The experiment connects an everyday measurement to the distinction between gravitational force and frame-dependent readings. Comparing conditions during acceleration and outside it helps demonstrate why apparent weight may vary even though the object’s mass remains constant.