Understanding the Force Involved in Cutting

The question describes Rohit using scissors to cut a card sheet. This activity involves a person applying force to a tool (scissors) to modify an object (card sheet).

Let's analyze the forces mentioned in the options:

• Muscular force: This force is generated by the muscles in our body. When Rohit uses scissors, he uses the muscles in his hand and arm to apply pressure and close the scissor blades. This force directly causes the cutting action.
• Frictional force: This force acts between surfaces in contact, opposing motion. Friction is present between the blades of the scissors and the card sheet, and it helps in the cutting process by holding the sheet in place, but it is not the primary force that Rohit is applying to cut the sheet.
• Mechanical force: This is a very broad term often related to forces transmitted or produced by machines or mechanical systems. While scissors are a simple machine, the origin of the force applied to the scissors is from Rohit's muscles. 'Muscular force' is a more specific description of the source of the force in this context.
• Gravitational force: This is the force of attraction between any two objects with mass. Gravity acts on the card sheet and the scissors, pulling them downwards, but it is not the force used by Rohit to cut the sheet horizontally or vertically.

When Rohit operates the scissors, the effort he exerts comes from his muscles. This muscular force is transmitted through the scissors to apply shear force to the card sheet, causing it to cut.

Conclusion

The main force that Rohit is applying to the scissors to perform the cutting activity is generated by his muscles. Therefore, muscular force is the force being used in this activity.