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zachdr1
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For a particle undergoing a constant velocity circular motion. I thought friction always acted in the direction of motion which would be in the tangential direction.
Kinetic friction acts opposite to relative motion at the contact. Static friction can point in any direction parallel to the contact plane.zachdr1 said:I thought friction always acted in the direction of motion...
So how do you determine the direction of static friction?A.T. said:Kinetic friction acts opposite to relative motion at the contact. Static friction can point in any direction parallel to the contact plane.
Depends on what else is known.zachdr1 said:So how do you determine the direction of static friction?
A.T. said:Depends on what else is known.
Since friction is the only horizontal force its direction should be obvious.zachdr1 said:How about for this problem?
Show us your free body diagram.zachdr1 said:How about for this problem?
Cartons having a mass of 5kg are required to move along the assembly line at a constant speed of 8 m/s. Determine the smallest radius of curvature for the conveyor so the cartons do not slop. The coefficients of static and kinetic friction between a carton and the conveyor are .7 and .5 respectively
zachdr1 said:For a particle undergoing a constant velocity circular motion. I thought friction always acted in the direction of motion which would be in the tangential direction.
zachdr1 said:How about for this problem?
Cartons having a mass of 5kg are required to move along the assembly line at a constant speed of 8 m/s. Determine the smallest radius of curvature for the conveyor so the cartons do not slop. The coefficients of static and kinetic friction between a carton and the conveyor are .7 and .5 respectively
Yes, "normal" is ambiguous. In the context of friction it usually means normal to the contact surface, but the OP meant normal to the path of the object.ZapperZ said:the frictional force/centripetal force points inwards (not in the normal direction).
A.T. said:Yes, "normal" is ambiguous. In the context of friction it usually means normal to the contact surface, but the OP meant normal to the path of the object.
Friction is a force that occurs when two surfaces are in contact and slide against each other. It acts in the normal direction because of the microscopic bumps and ridges on the surfaces that come into contact. These irregularities cause the surfaces to push against each other in the direction perpendicular to the surface.
Friction in the normal direction can either prevent or slow down motion. When an object is placed on a surface, the normal force (or force perpendicular to the surface) acts against the weight of the object, creating friction. This friction can cause the object to either stay in place or move at a slower speed.
The magnitude of friction acting in the normal direction depends on the weight of the object, the roughness of the surfaces, and the amount of force pushing the surfaces together. The rougher the surfaces and the heavier the object, the greater the friction will be in the normal direction.
No, friction can only act on objects that are in contact with each other. However, if an object is on an inclined plane, the component of the weight acting perpendicular to the surface can create a normal force and thus, friction in the normal direction.
Friction can be reduced by using lubricants to create a smooth surface, using materials with lower coefficients of friction, and by reducing the weight or force on the surfaces in contact. Additionally, increasing the surface area of contact can also decrease the amount of friction acting in the normal direction.