Lever principle is an important concept in physics and a common tool in daily life. In this paper, the application of leverage principle will be discussed in depth, and several common leverage tools and their characteristics will be introduced to help readers better understand leverage principle.

Labor-saving lever army

Wire cutters (a), iron scissors (c), claw hammers (e), wrenches (h) and screwdrivers (i) are the representatives of the labor-saving lever army. When using these tools, the power arm is larger than the resistance arm, which makes you save effort and worry!

Hard lever class

Tweezers (b), hair clippers (d), chopsticks (f), brooms (g) and coal tongs (j) are the representatives of the strenuous hurdle team. Although the power arm is smaller than the resistance arm, they can save you more distance and make the operation more handy!

Equal arm lever representative

The balance (K) is the representative of the equal arm lever. Its power arm is as long as the resistance arm, which saves neither labor nor distance, but its accuracy is extremely high, and it is an excellent tool to measure quality!