PTMS2033 (1.5&1.6)

In the context of the human body's lever system, what role does the fulcrum play?

• The resistance or weight being moved.

• It determines the length of the lever system.
• The component generating forces in the lever.

• It acts as the pivot point for the lever system.

In the context of a lever system, what is the Effort Arm (EA) defined as?

• The centre of gravity of the part to be moved.

• The distance between the effort and the fulcrum.

• The distance between the load and the fulcrum.

• The weight of the object being lifted.

Which lever class is most common in the human body, where the axis is typically located at one end, the effort is applied at the other end, and the resistance is located between them?

• Third-class lever
• Fourth-class lever
• Second-class lever
• First-class lever

What is the mechanical advantage of a third-class lever in the musculoskeletal system?

• Equal to 1

• Less than 1

• Depends on the specific lever
• Greater than 1

In a scenario where you use a pair of scissors, what part of the scissors serves as the fulcrum, effort applied, and where the resistance is encountered, respectively?

• The paper being cut; the handles; the screw

• The paper being cut; the screw; the handles

• The handles; the screw; the paper being cut

• The screw; the handles; the paper being cut

In the human body, which joint configuration represents a first-class lever, where the axis (fulcrum), applied force, and resistance are positioned in a sequential order?

• Ankle joint
• Elbow joint
• Neck joint

• Shoulder joint

In daily life, which of the following best exemplifies the application of a second-class lever?

• Opening a door by turning the handle.

• Lift and push a wheelbarrow with load.

• Using tweezers to pick up a small object.

• Using a fishing rod.

Which of the following body movements represents a second-class lever?

• Kicking a ball
• Turning the head

• Standing on tiptoes

• Bending the elbow

How is mechanical advantage (MA) calculated in a lever system?

• MA = EA + LA

• MA = EA - LA

• MA = EA / LA

• MA = LA / EA

What is the characteristic mechanical advantage (MA) and efficiency implication in a third-class lever?

• MA > 1; Work is done efficiently

• MA < 1; Work is done efficiently

• MA = 1; Work is done efficiently

• MA < 1; Work is less efficient