1. (i)A rope, paralleltothefloor, pulls about alongtheflooratoonslantspeed Theboxhas amass ofS kgandthe twsionintheropeisBflN.Whatisthemagnimdeofthe fiiction force? Answer: (ii) Suddenly the box slides onto a smoother part ofthe floor where the friction force is only halfofits original value. However,thetensioninthempedoes mtchangeWhatisthemagnimde ofthe acoelerationoftheboxonflnis smoflHsmfaoe?
1. (i)A rope, paralleltothefloor, pulls about alongtheflooratoonslantspeed Theboxhas amass ofS kgandthe
twsionintheropeisBflN.Whatisthemagnimdeofthe fiiction force? Answer: (ii) Suddenly the box slides onto a smoother part ofthe floor where the friction force is only halfofits original value. However,thetensioninthempedoes mtchangeWhatisthemagnimde ofthe acoelerationoftheboxonflnis
smoflHsmfaoe?Answer: 2. Arowerwithrnass offifl kgjumpsmntofher boataflerwinning arace;theboathas amass of2l] kglntheprocess,
theboatpushes onthe rowerwith afiarce offifl N. Whatisflzemagnimde oftheforce onthe hoatbythe rower"?
Answer: 3. Amechanical armpnsheshvoblocksthataresittingonatnble;there isfir’czitm hetweenthehlocksandthetable.’l‘he
blocks moveflxwardthelefl, slowing down. Sketchendlahelafiee—bodydiagrarnfishlockfionly. q——V Mechanical arm Table 4. Ametalsphereissuspendedhytwocables, TLandTg,eachmaking335“anglewithfl1ehorizontal_ ThetensioninTn
is 2000151, andsoisfliatinTL_’I’heyaxispointsup,fl1ex axispointstotheright TL Ts i)Whatisthexfl1onzontal)oon1pcmentoffl1etwsioninTn-.? Answer: ii) Whatistheweightofthe sphere? Answer: 5. Anolqiect is rnrwing cmmterclockwise at oonstnntspeedinthe circulartrajectoryl sham Its positions at three difl‘erem
times are indicated by dots; its velocity vectors at the first (top) and last (bottom) positions are shown. Circle the arrow
that is closest to the direction ofaocelerafion ofthe object at the second (middle) position ll\/\x III-.-
III-.-
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