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Physics   Form 4    Chapter 2 Force and Motion I
                                                                       Physics  Form 4  Chapter 2 Force and Motion I
                Branch of tree                      Rear-end collision

                A stick is used to jerk the branch
                of a guava tree. At the end of     When a rear-end
                the branch, there is a big guava.   collision occurs, the   Headrest
                The guava tends to remain in its   car and the body of the
                original state of rest due to its   driver move forward
                inertia. This will cause its stalk to   suddenly. The headrest
                snap and the guava will fall to the   supports the head of
                ground.                            the driver when it is
                                                   thrown backwards.                                         Chapter






                                                                                                            2
                                    Guava








                                                Effects of

                Tissue paper                     Inertia                  Steel structure of lorry

                When a sheet of tissue                                    A steel structure is fitted in the
                paper is pulled quickly                                   space between the driver and the
                from a tissue box, the                                    load of a timber lorry. This steel
                box will not move. The                                    structure prevents the logs from
                inertia of the box causes                                 moving forward and knocking
                it to resist motion and                                   against the driver compartment
                remain at rest.                                           when the lorry stops suddenly.
                                                                              Steel structure








                 Drying hair

                 A girl dries her hair by turning her head
                 fast. Due to inertia, the water from the
                 hair continues to move when the hair has
                 stopped moving and hence is removed from
                 the hair.







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       02 FOC PHYSICS F4 3P.indd   39                                                                29/01/2020   1:39 PM
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