A rectangular body is held at rest by pressing it against a vertical wall.1)Why is it easier to hold the body if the surfaces in contact are not smooth 2)Why is the pressing force required greater than weight mg of the body 3)why is the required pressing force dependent on friction between surfaces in contact
1. It is easier to bring the object downward because Normal component of force decreases the weight of body
2. When object is vertical plane then including there is another force called Reaction force N acting normal to the object so to overcome this force we have to exert some more Force.
3. When we exert a force then then due to friction the body want to remain in its initial position,so to change its position the required force will be dependent on Friction between the two surfaces.
2. When object is vertical plane then including there is another force called Reaction force N acting normal to the object so to overcome this force we have to exert some more Force.
3. When we exert a force then then due to friction the body want to remain in its initial position,so to change its position the required force will be dependent on Friction between the two surfaces.