Class One Levers and Their Functions

The video tutorial explains the concept of levers, focusing on class one levers where the fulcrum is positioned between the effort and the load. Examples such as scissors, claw hammers, and spoons are used to illustrate how these levers function. The tutorial also covers the mechanical advantage and velocity ratio of levers, explaining how they can act as force or speed multipliers. Additionally, it highlights the presence of class one levers in the human body, using the nodding action of the head as an example.

What is the primary function of a lever?

• To increase the speed of an object

• To make work easier by amplifying force

• To change the direction of an object

• To decrease the weight of an object

In a class one lever, where is the fulcrum located?

• Between the effort and the load

• Next to the effort

• Next to the load

• At the end of the lever

Why can a pair of scissors be considered a class one lever?

• Because it is used to cut materials

• Because the fulcrum is between the effort and the load

• Because it has two handles

• Because it has a fulcrum at the end

What role does the handle of a claw hammer play in its function as a lever?

• It acts as the fulcrum

• It is where the load is applied

• It is where the effort is applied

• It acts as the load

How does a spoon function as a class one lever when opening a jar lid?

• The spoon's handle acts as the fulcrum

• The spoon's bowl acts as the effort

• The spoon's tip acts as the fulcrum

• The handle acts as the load

What is the mechanical advantage of a lever with a longer effort arm than load arm?

• Zero

• Less than one

• Equal to one

• Greater than one

In a physical balance, what is the relationship between the effort arm and the load arm?

• Effort arm is shorter

• Both are equal

• Load arm is longer

• Effort arm is longer

Why are scissors considered speed multipliers?

• Because they increase the force applied

• Because they increase the speed of the load

• Because they decrease the effort needed

• Because they balance the load and effort

What is an example of a class one lever in the human body?

• The wrist joint

• The elbow joint

• The knee joint

• The nodding action of the head

What happens to the velocity ratio when the effort arm is shorter than the load arm?

• It becomes zero

• It becomes greater than one

• It becomes less than one

• It remains equal to one