## Biomechanics Exam 1 > Mechanical Advantage > Flashcards

Flashcards in Mechanical Advantage Deck (13)
1
Q

What is the equation for torque?

A

Torque = force x distance

2
Q

What is the equation for mechanical advantage?

A

MA = effort arm / resistance arm

3
Q

A
• The ability to preform more work with less effort
• The ability to move more weight easier
• A numerical value used to describe the efficiency of simple machines
4
Q

A
• When the MA number is less than 1
• Means that there needs to be a lot of effort for the movement that won’t be strong, but can happen fast with lots of range of motion
5
Q

What does it mean when the mechanical advantage ratio is greater than 1?

A
• The effort arm is larger than the resistance arm
• There is increased mechanical advantage (efficiency)
6
Q

What does it mean when the mechanical advantage ratio is less than 1?

A
• The effort arm is smaller than the resistance arm
• There is no mechanical advantage (aka there is a mechanical DISadvantage)
• There can be greater displacement and speed of the load)
7
Q

What range of mechanical advantage can a first class lever supply?

A
• 1st class levers can create both a mechanical advantage and a mechanical disadvantage
• The lever can favor either power OR distance depending where the fulcrum is placed (and how that affects the ratios of the arms)
8
Q

What range of mechanical advantage can a second class lever supply?

A
• The mechanical advantage will always be higher than 1
• The force arm by definition will always be longer than the resistance arm
• This lever always favors strength
9
Q

What range of mechanical advantage can a third class lever supply?

A
• There will always be a mechanical DISadvantage
• The force arm by definition will always be shorter than the resistance arm
• This lever always favors motion and speed
10
Q

A
• 3rd class levers
• They provide better motion
• It allows for muscles to be packed better
^ It means we need to work a lot harder to move things
11
Q

What does it mean when the torque is 0?

A

There is no movement

12
Q

How can you compare two efforts?

A

Force 1 x distance 1 = force 2 x distance 2

13
Q

Why is it important to know that humans are mostly ___ class levers when working with patients?

A

We can manipulate the resistance arm and effort arm ratios to allow the patient to work harder (or not as hard) for certain movements