STATIC FRICTION

What is Static Friction?

• Friction between two surfaces that are moving alongside each other

• Friction between two stationary surfaces that occur as soon as we try to move them alongside each other

• Friction between any number of surfaces

• None of the Above

What is the correct comparison between static and kinetic friction among the following options?

• Static friction is sometimes stronger and sometimes not.

• Kinetic friction is usually stronger than static friction.

• Static friction is usually stronger than kinetic friction.

• Static and kinetic friction are equally strong.

Let Fa represent the force applied to push a box and Fb represent static friction between the floor and the lower surface of the box. Which of the following statement(s) are correct according to the said situation?

• Fa=Fb=0

• Fa=Fb

• Fa<Fb

• Fa>Fb

• Fb<Fa

Object S is kept on a rougher surface as compared to that of T. Which of the following statements regarding static friction are incorrect?

• Both S and T experience the same static frictional force.

• Object S experiences a smaller static frictional force compared to that of Object T.

• Both the object would not experience static frictional force of any kind.

• Object S experiences a larger static frictional force than that of Object T.

Which of the feature is characteristic to that of a soft surface?

• More frictional force

• Less frictional force

• Both A and B

• Sometimes more and sometimes less

Static friction exists because various surfaces have imperfections and ------- occurs between the two surfaces, resulting in the need of -------- of the surfaces.

• Adhesion, abrasion

• Reaction, separation

• Abrasion, separation

• Separation, adhesion