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?
A moment in mechanics refers to the turning effect of a force around a pivot point. It is calculated by multiplying the magnitude of the force by the perpendicular distance from the pivot point to the line of action of the force.
A force is a push or pull that can cause an object to accelerate, while a moment is the rotational effect of a force. A force can cause linear motion, while a moment can cause rotational motion.
Friction in mechanics is a force that resists the motion or attempted motion of two surfaces in contact with each other. It is caused by the microscopic roughness of the surfaces and can be influenced by factors such as the type of surfaces, the force pressing the surfaces together, and the presence of lubricants.
Friction can either help or hinder motion. In some cases, friction can provide the necessary traction for an object to move, such as the wheels of a car on the road. In other cases, friction can slow down or stop motion, such as the brakes on a car or the resistance of air against a moving object.
Friction can be reduced by using lubricants, such as oil or grease, between two surfaces. Smooth surfaces also have less friction than rough surfaces, so polishing or smoothing surfaces can also reduce friction. Additionally, using rolling motion instead of sliding motion can also reduce friction.