Which example represents a class 2 lever?
A.) a car door being opened and shut
B.) tweezers plucking hairs
C.) a screwdriver opening a paint can
D.) salad tongs picking up salad
B.) tweezers plucking hairs
To determine which example represents a class 2 lever, it is helpful to understand what a class 2 lever is.
In a class 2 lever, the load is located between the fulcrum and the effort. When a force is applied to the effort arm, it causes rotation around the fulcrum, resulting in movement of the load.
Let's analyze the examples provided:
A.) A car door being opened and shut: In this scenario, the fulcrum is located at the hinges of the car door. The effort is applied by pushing or pulling the handle, and the load is the weight of the door. The load is located on the opposite side of the fulcrum as the effort, making it a class 2 lever.
B.) Tweezers plucking hairs: In this case, the fulcrum is located at the point where the two arms of the tweezers are connected. The effort is applied when the user squeezes the tweezers, and the load is the hair being plucked. The load is located on the same side as the effort, rather than between the fulcrum and effort. Therefore, it is not a class 2 lever.
C.) A screwdriver opening a paint can: In this example, the fulcrum is located where the tip of the screwdriver meets the lip of the paint can. The effort is applied by applying force to the handle, and the load is the resistance of the paint can lid. The load is located between the fulcrum and effort, making it a class 2 lever.
D.) Salad tongs picking up salad: In this situation, the fulcrum is located at the pivot point of the tongs. The effort is applied by squeezing the handles, and the load is the weight of the salad being picked up. Just like in example B, the load is on the same side as the effort, so it is not a class 2 lever.
Therefore, the correct answer is C.) a screwdriver opening a paint can.
The correct answer is option B.) tweezers plucking hairs.
In a class 2 lever, the load is located between the fulcrum and the effort. Tweezers operate as a class 2 lever, where the load (hair being plucked) is located between the fulcrum (the point where the tweezers pivot) and the effort (the force applied by squeezing the tweezers).