Apparent weight
Apparent weight is a property in physics where the normal conceived weight of an object is changed, generally due to a force in the upward or downward direction. It is also known as the "force the body exerts on whatever it rests on."[1] This property is exhibited when an object is "partially or completely immersed in a fluid", where there is an "upthrust" from the liquid that is working against the force of gravity.[2] An opposite example is when an object or person is riding in an elevator. When the elevator begins rising, the object begins experiencing a force in the downward direction. If a scale was used, it would be seen that the weight of the object is becoming heavier because of the downward force, changing the apparent weight.[3]
The role of apparent weight is also important in fluidization, when dealing with a number of particles, as it is the amount of force that the "upward drag force" needs to overcome in order for the particles to rise and for fluidization to occur.[4]
[edit] References
- ^ Beiser, Arthur (2004). Schaum's outline of theory and problems of applied physics. McGraw-Hill Professional. pp. 59-60. http://books.google.com/books?id=soKguvJDgmsC&pg=PA59&dq=%22apparent+weight%22&hl=en&sa=X&ei=Po3zTqjjFcKniQKQwPjFDg&ved=0CEcQ6AEwBA#v=onepage&q=%22apparent%20weight%22&f=false. Retrieved December 22, 2011.
- ^ Ramtal, Dev; Dobre, Adrian (2011). Physics for Flash Games, Animation, and Simulations. Apress. pp. 196-197. http://books.google.com/books?id=F690GsJn3s8C&pg=PA196&dq=%22apparent+weight%22&hl=en&sa=X&ei=Po3zTqjjFcKniQKQwPjFDg&ved=0CDwQ6AEwAg#v=onepage&q=%22apparent%20weight%22&f=false. Retrieved December 22, 2011.
- ^ Oman, Robert M.; Oman, Daniel M. (1997). How to solve physics problems. McGraw-Hill Professional. pp. 71-75. http://books.google.com/books?id=S0z_4ZyLiFwC&pg=PA71&dq=%22apparent+weight%22&hl=en&sa=X&ei=0IzzTs7OC8mniALlkc2dDg&ved=0CDEQ6AEwAA#v=onepage&q=%22apparent%20weight%22&f=false. Retrieved December 22, 2011.
- ^ Rhodes, Martin J. (2008). Introduction to particle technology. John Wiley and Sons. pp. 169-171. http://books.google.com/books?id=P9Qgvh7kMP8C&pg=PA169&dq=%22apparent+weight%22+particle&hl=en&sa=X&ei=97LzTsHaI-LkiALawP2aDg&ved=0CD0Q6AEwAg#v=onepage&q=%22apparent%20weight%22%20particle&f=false. Retrieved December 22, 2011.
