The discussion revolves around calculating the total force exerted by a weight lifter lifting a weight, considering both the mass of the lifter and the weight being lifted, along with the acceleration involved.
Some participants have provided insights regarding the distinction between net force and total force, suggesting that gravitational forces must be considered. There is an ongoing request for clarification on how to calculate the total force, indicating a productive exchange of ideas.
Participants are discussing the application of Newton's laws, particularly questioning the relevance of Newton's third law in this context. There is an emphasis on understanding the forces acting on both the weight and the weight lifter.
nukeman said:Homework Statement
A weight lifter who has a mass of 90kg lifts a weight of 50kg, which accelerates the weight at a rate of 0.47 m/s^2
Would the total force simply be (140kg)*(0.47m/s^2) = 65.8 n?
Homework Equations
The Attempt at a Solution
BobG said:You have the force of gravity on the weightlifter.
You not only have the force of gravity on the weight, but the weightlifter is applying a force to accelerate it.
This would be the total force applied to the floor the weightlifter is standing on.