The discussion revolves around a mechanics problem involving moments and friction, specifically analyzing the forces acting on a trolley in equilibrium and the effects of friction at different points.
Some participants have confirmed calculations regarding moments, while others express confusion about the role of friction and the normal force. There is an ongoing exploration of the relationships between forces and moments, with hints provided to consider diagrams and specific points of action.
Participants mention a coefficient of friction and specific distances related to the forces, indicating that the problem is based on a past exam paper. There is a focus on understanding the implications of the applied forces and the distribution of weight on the trolley.
What about the forces at B?Spadez said:2. The attempt at a solution
(i) Moment of F = 70 x 800 = 56000
Moment of weight = 500 x 270 = 135000
Therefore the trolley remains at rest. Is this right?
No. There is a reaction force of the ground on the object at point B. Figure out that normal force. Then you can compare the applied force F to the static friction force.Spadez said:Am i not accounting for the weight at B by finding the moment of the weight force?
Force F as in the applied force on the object. (Look at the diagram!)Spadez said:Force F as in the friction force on the wheel or the force pushing the trolley?