Question

A force of 5 kgf is required to cut a metal sheet. A pair of shears used for cutting the metal sheet has its blades 5 cm long, while its handles are 10 cm long . What effort is needed to cut the sheet?

• A. 2.7 kgf
• B. 32.7 kgf
• C. 2.5 kgf
• D. 132.7 kgf

Answer 1

The correct option is C

2.5 kgf

Load = 5 kgf

Load arm = 5 cm

Effort arm = 10 cm

By principle of lever,
Effort arm $\times$ Effort = Load arm $\times$ Load
$10\times \text{effort}=5\times 5$
$\text{effort}=\frac{25}{10}=2.5kgf$