Q57 / 60 · KVPY 2011 (SA) · Physics
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


- Correct answerAthe 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
- Bthe normal force by the ground is equal and opposite to the weight of the toy
- Cthe pushing force ( $\vec{F}$ ) of the child is balanced by the equal and opposite frictional force
- Dthe pushing force ($\vec{F }$) \text { of the child is balanced by the total internal force in the toy generated due to } deformation
Solution
$\because \sum \mathrm{F}_{\mathrm{ext}}=0$
$\therefore \mathrm{a}_{\text {system }}=0$
Hence, the correct answer is option: 'A'.