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Question: Answered & Verified by Expert
A small child tries to moves a large rubber toy placed on the ground. The toy does not move but gets deformed under her pushing force $(\overrightarrow{\mathrm{F}})$ which is obliquely upward as shown. Then
PhysicsLaws of MotionKVPYKVPY 2011 (SA)
Options:
  • A the resultant of the pushing force ($\vec{F }$ ), weight of the toy, normal force by the ground on the toy and the frictional force is zero
  • B the normal force by the ground is equal and opposite to the weight of the toy
  • C the pushing force ( $\vec{F}$ ) of the child is balanced by the equal and opposite frictional force
  • D the pushing force ($\vec{F }$) \text { of the child is balanced by the total internal force in the toy generated due to } deformation
Solution:
2616 Upvotes Verified Answer
The correct answer is: the resultant of the pushing force ($\vec{F }$ ), weight of the toy, normal force by the ground on the toy and the frictional force is zero
$\because \sum \mathrm{F}_{\mathrm{ext}}=0$
$\therefore \mathrm{a}_{\text {system }}=0$

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