# A crowbar is used to pull a nail. The length of the effort arm of the crowbar is 26 \ cm and the...

## Question:

A crowbar is used to pull a nail. The length of the effort arm of the crowbar is {eq}26 \ cm {/eq} and the resistance arm is {eq}4.2 \ cm {/eq}. What force in {eq}N {/eq} is required to pull a nail if the friction force holding the nail in place is {eq}120 \ N {/eq}?

## Crowbar

Crowbar is a simple machine belongs to the class of levers. The levers are belong to three different classes. In class one levers fulcrum is placed between the load arm and force arm. In class two levers fulcrum is placed at one end force is applied at the other end, load placed in between the fulcrum and the applied force end. In class three type of levers fulcrum is again at the end force is applied some where between the load and fulcrum. The crowbar belongs to the class one type of lever.

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Given data

• Length of the effort arm {eq}L_1 = 0.26 \ m {/eq}
• Length of the load arm {eq}L_2 = 0.042 \ m {/eq}
• Force of friction holding the...

Levers: Definition, Classes & Examples

from

Chapter 8 / Lesson 3
52K

Understand the role levers play in our everyday lives. Learn what is a lever is, identify the classes of levers, and see examples.