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# Four solid spheres P, Q, R and S are made to move on a horizontal surface which is rough enough. Sphere P is given a spin and released sphere Q is given a linear velocity and released ; sphere R is given a reverse spin and a forward linear velocity and released ; sphere S is given a forward spin and a forward linear velocity as shown in figure the direction of frictional force F for P, Q, R and S will be along

- Left, for all
- Right left right left respectively
- Right, left, left right respectively
- Right left, left and either right or left respectively

## The correct answer is: Right left right left respectively

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