the answer is lever. for a+ users
1st class lever
lever
Its the CR2032 battery
Lever
lock and key is the lever of second type
A dustpan is a 2nd class lever
im pretty sure a rake is a class 3 type lever
A lever type can opener
first class lever
3rd Class Lever
3rd Class Lever
Scales work as a lever by balancing the weight of an object on one end with standard weights on the other end. As the object exerts a force downwards, the lever arm moves, causing the standard weights to move as well until equilibrium is reached. The position of the standard weights then gives an indication of the object's weight.
Never heard of a "lever lawn mower"
The third class lever is the most common lever in the body.
Third-class lever
class III lever