The discussion clarifies the distinction between weight and gravitational force in the context of a man lifting a mass. Weight is defined as the downward force exerted by gravity on an object, while the force applied by the mass to the man's hand is identified as a contact force, specifically the normal force. When the mass is held stationary, the force it applies equals its weight; however, if the mass accelerates, this force may differ from its weight. The conversation emphasizes the importance of understanding these concepts through Newton's Third Law of Motion.
PREREQUISITESStudents of physics, educators explaining fundamental mechanics, and anyone interested in understanding the nuances of forces in lifting scenarios.
To elaborate it I would use Newtons 3rd Lawphinds said:I think I understand what you are asking but I find it to be a very confusingly phrased question. Perhaps it would work if you were to look up the definitions of the terms mass, force, weight, and gravity to help clarify what you are asking.
But notice weight is force something is pulled BY but it is pulling in this casePhysicist97 said:The force of gravity and weight are essentially the same. Weight is an everyday word we use in our language that represents the downward force of an object due to the Earth's pull. Weight IS the force of gravity experienced by an object. The mass that is in your hand would exert a downward gravitational force on your hand. (As far as I know, physicists don't talk in terms of weight, always in terms of gravitational force).
No. The force the mass applies to the hand is a contact force. Also called a mechanical or normal force.shayan haider said:what is the force the mass is applying to hand of man is it Weight or Force of gravity
shayan haider said:Now what is the force the mass is applying to hand of man is it Weight or Force of gravity because weight acts on mass itself. Then what we call it precisely?
I am sure that the thing is applying force less than its weight!Drakkith said:The force on the hand? Well, if we list the forces acting on the hand, we should be able to find out.
1. The weight of the man's hand (mg) acting downward.
2. The force from the man's wrist acting upward.
3. The force from the mass the hand is holding up, acting downward.
Now, it would be easy to think that number 3 is also the weight of the mass. But it's not. The magnitude of the force is equal to the weight of the mass, but, crucially, if the man were to drop his hand so that his hand and the mass accelerate downward, the force of the mass on the hand would NOT be equal to the mass's weight, but a lesser amount. This force is a contact force, the normal force, like DaleSpam said.
If the mass that you hold in your hand doesn’t accelerate, the force it applies to your hand is equal to its weight. If the mass accelerates it can be more or less in magnitude, depending on the direction of acceleration.shayan haider said:I am sure that the thing is applying force less than its weight!