A little girl is pulling a toy car parallel to the ground on the rough surface of a table as shown in the figure below. The toy car is displaced towards the girl. 2 (a) Write the nature of work done by the (i) muscular force exerted by the girl. (ii) frictional force on the surface of table. (iii) gravitational force of the earth. (b)Mention the angle between frictional force and displacement of the toy car.

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Answers 2

Answer:

A) Frictional force on the surface of the table

B) 90°

Explanation:

Answer:

(a) The nature of the work done by (i) muscular force is positive (ii) frictional force is negative (iii) gravitational force is zero. (b) The angle between frictional force and displacement of the toy car is [tex]180\textdegree[/tex].

Explanation:

  • The nature of the work done depends on the force's direction and the displacement.
  • The nature of work done may be zero, negative, or positive.

Solution part (a):

(i) The nature of work done by the girl's muscular force is positive as both the displacement and force are towards the right side.

(ii) The nature of work done by the frictional force is negative as the displacement is towards the right and the frictional force is towards the left.

(iii) The nature of work done by the Earth's gravitational force is zero as the displacement is towards the right and the Earth's gravitational force is downwards perpendicular to the displacement.

Solution part (b):

The displacement of the toy's car is towards the right and the frictional force is towards the left so, the angle between frictional force and displacement of the toy car is [tex]180\textdegree[/tex].

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