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SAI INTERNATIONAL SCHOOL
                                                          Class8
                                                  Home Assignment
                                                   Subject-Physics
                                                       CH-Friction
                            Subtopic-Methods to increase and decrease friction


               INSTRUCTIONS:
                       .
                     For Assertion& Reason question follow the following directions.
                       DIRECTION: Each of these questions contains an Assertion followed by Reason. Read them
                       carefully and answer the question on the basis of following options. You have to select the one
                       that best describes the two statements.
                       (a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
                       (b) If both Assertion and Reason are correct, but Reason is not the correct explanation of
                       Assertion.
                       (c) If Assertion is correct but Reason is incorrect.
                       (d) If Assertion is incorrect but Reason is correct.
                       (e) If Assertion & Reason both are incorrect.
                   1.    Assertion: Machine parts needs to be oiled regularly.                                 1
                         Reason: Lubricants decrease friction.
                   2.    Assertion: Heavy Suitcase are fit with rollers.                                       1
                         Reason: It gives a nice look.
               Fill in the blanks
                   3.    Friction causes __________ and ______________                                         1
                   4.    Sprinkling of powder on the carom board _____________ friction.                       1
               True/ False
                   5.    Lubricants reduces friction.                                                          1
                   6.    Friction can be reduced by pressing the surface hard against each other.              1
               Subjective Question
                   7.    Explain why sportsmen use shoes with spikes.                                          1
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