A force of magnitude 58N is needed to start a box sliding across the floor. The weight of the box is 20N. Draw all the forces acting on the box. How large is the force of friction? Is the frictional force static or kinetic? what is the coefficient of friction? (Em subject)
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Learning Objectives
Discuss the general characteristics of friction.
Describe the various types of friction.
Calculate the magnitude of static and kinetic friction.
Friction is a force that is around us all the time that opposes relative motion between systems in contact but also allows us to move (which you have discovered if you have ever tried to walk on ice). While a common force, the behavior of friction is actually very complicated and is still not completely understood. We have to rely heavily on observations for whatever understandings we can gain. However, we can still deal with its more elementary general characteristics and understand the circumstances in which it behaves.
Friction
Friction is a force that opposes rela tive motion between systems in contact.
One of the simpler characteristics of friction is that it is parallel to the contact surface between systems and always in a direction that opposes motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, friction slows a hockey puck sliding on ice. But when objects are stationary, static friction can act between them; the static friction is usually greater than the kinetic friction between the objects.
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- The net force is the total sum of all forces FRICTION. PULL. Net Force =0. Net Force =0. Drag. Weight You and a friend are sliding a large 100-kg box across the floor. Your friend.
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