Contact Forces Introduced To introduce contact forces the normal force and the f

Question

Contact Forces Introduced To introduce contact forces the normal force and the force due to friction. Part A Two types of contact forces operate in typical mechanics problams the normal force (usually designated by ri) and frictional forces (designated by f). The normal force is aways perpendicular to the plane of contact, whereas the force due to friction is parallel to the plane of contact When two objects side against one another, which of the following statements about the force of friction between O The magntude of the frictional force is always equal to py n The magntude of the frictional force is always less tan n When two surfaces side aganst each ather, experiments show three things about the resulting kinebe frictional force The magntude of te frictional force is determined by other forces on the obects so it can be either equal b Submit 1. The frictional force opposes the relative motion of the two surfaces at their point of contact 2. The magnitude of the kinetc frictional force Part B f is proportional to the magnitude of the normal force,n 3. The ratio of f to r is fairly constant over a When two objects are in contact with no relative motion, which of the following statements about the frictional force wide range of speeds The constant of proportionaity is caled the coefficient of knatic friction and is often designated As long as me sliding continues, the frictional forces fk . The magnitude of the frict onal force is always equal to Kra. The magnitude of the frictional force is always less than 4 The magnitude of the frictional force may be either equal so or iess than pa,n When there is na relative motion of the two surfaces, the magnitude of the static frictional force can assume an aue from zero up to a manmurm n, where A is known as the coefficent of static frict on, is, invariably larger Submi ReauessAnsW than : The frictional force for surfaces that do not move relative to each ofher is theretore f, a. The equality n holds only aten the surfaces are on the verge of sliding Part C

Explanation / Answer

For part A) when sliding against one another, option A will be correct. Always equal to ukN.

PartB) not sliding

Option C is correct

May be either less than or equal to uN.

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