What are two examples of Class two levers? Choose all that apply
a
scissors
b
wheelbarrow
c
hammer and nail
d
bottle opener
e
shovel
b. Wheelbarrow and d. Bottle Opener are examples of Class two levers.
To determine which options are examples of Class two levers, we need to understand what a Class two lever is. Class two levers have the fulcrum positioned at one end, the input force (effort) applied at the other end, and the output force (load) located between the fulcrum and input force.
Let's go through each option:
a) Scissors: Scissors are not an example of a Class two lever. They consist of two Class one levers joined together, where the fulcrum is in the middle. Therefore, scissors cannot be classified as a Class two lever.
b) Wheelbarrow: A wheelbarrow is indeed an example of a Class two lever. The fulcrum is the wheel axle, the input force is applied by the person holding the handles, and the output force is the load (weight) being carried in the wheelbarrow.
c) Hammer and nail: The hammer and nail are not an example of a Class two lever. When using a hammer to drive a nail, the fulcrum is not present, and the force is applied directly to the nail without using a lever.
d) Bottle opener: A bottle opener is also an example of a Class two lever. The fulcrum is the edge of the bottle cap or bottle lip, the input force is applied by the person gripping the bottle opener handle, and the output force is exerted on the bottle cap, prying it open.
e) Shovel: A shovel is not an example of a Class two lever. It is typically considered a Class three lever because the fulcrum is at one end, the input force is applied near the other end, and the load (scoop of dirt, snow, etc.) is between them.
Therefore, the two examples of Class two levers from the given options are:
b) Wheelbarrow
d) Bottle opener
Two examples of Class two levers are:
1) Wheelbarrow
2) Bottle opener