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Maybe the difference between them (actual and apparent weight) is minor on the earth? What about the following example from Wikipedia " In a simple case such as a 40 kg object resting upon a table, the normal force on the object is equal but in opposite direction to the gravitational force applied on the object i.e. the weight of the object. In this case the normal force is given by, 40 kg · 9.81 m/s2=392.4 newtons where 9.81 m/s2 is equal to the acceleration due to gravity (near the Earth's surface). In another case where the same object as mentioned above is on a 40 degree incline, we have to insert cos θ into the equation for normal force. Fnormal = mass · gravity · cos θ. So solving for the normal force, we get: FN = 40kg · 9.81m/s2 · cos 40° = 300.6 newtons " http://en.wikipedia.org/wiki/Normal_force

So, if the object isn't accelerating and it's perpendicular to the surface, the apparent and actual weight are equal in magnitude.

I think we can use F = m*a, or W = m*g in case of actual weight, i.e. gravitational force. Isn't apparent weight different?

Hello everybody! Can we find the mass of an object from its apparent weight, i.e. what's measured by scales? Thank you in advance!

Thanks D H! thanks everybody for the answers!

It seems they're different according to the following site: http://www.jacquardsystems.com/MComputing/1998/4/p14.htm Quotation: { An American pound is 0.3732 kilograms (which is the troy pound), so the comparison would be "true". A British pound is 0.4536 kilograms (which is the avoirdupois pound) }

Thanks! We in my country already use the SI units, but I just want to know the difference if there's

Hello everybody! My question is about the measurement of mass: Are the American and British pound equal? Do Americans use the Troy pound? Thanks in advance!

Maybe torque is a special case of moment. The following definition is from "Worldbook encyclopedia": Moment, in physics, is the product of a quantity multiplied by a particular distance from a fulcrum, or axis. Moment of force, also called torque, is an example.

Thanks a lot for help!

Nice idea!

Hello everybody! Is there any difference between a torque and a moment? Both are forces multiplied by the distance. Thanks!