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Friction
 1) Which of the following can be a reason for friction? Both 1 and 2 Interlocking of projections and compressions on the surface of contact. Electromagnetic force The adhesive force between the surfaces.

 2) Frictional force is an example of what type of force? Can be contact or non contact Non contact force None of these Contact force

 3) What is the reason for slipping while walking on ice? There is a lot of friction on ice. There is little friction on ice. There is a large normal reaction. None of these

 4) What is the direction of frictional force ? Normal to the direction of movement of object Depends on the angle of inclination of the plane with the horizontal Opposite to the direction of movement of the object Same as that of movement of the object

 5) Which best describes friction? Vector quantity Scalar quantity None of these Can be scalar or vector

 6) What is the type of friction when a body rolls over another body? Rolling friction Limiting friction Static friction Sliding friction

 7) Which of the following statements is correct? The relation between sliding friction and rolling friction can be vary with the environment Sliding friction is greater than rolling friction Rolling friction is greater than sliding friction Sliding friction and rolling friction are of same magnitude

 8) Which type of friction belongs to the category of kinetic friction? Limiting friction Rolling friction Both 1 and 3 Sliding friction

 9) Maximum value of static friction is called .......... . Normal reaction Coefficient of friction Rolling friction Limiting friction

 10) A force of 294N is required to start moving an object of 100kg in a horizontal plane. Calculate the coefficient of friction. 0.3 0.03 0.6 0.1

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