Mechanical advantage = Deffort / Dresistance

Mechanical advantage = Deffort / Dresistance

It’s only a model…

It’s only a model…

Model

Effort ArmResistance

Arm

Force needed to hold 50 g

Distance Effort

moved

Distance resistance

moved

By the end of the day today you need to have…

• Modeled and recorded data on 4 (four) 3rd class levers

• Modeled and recorded data on 4 (four) 1st class levers (elbow extended as your first one) – expanded table to accommodate new data

• Answered the questions on levers

Lever Questions• What do your data indicate? Ratio? Pattern?• From your data, what can you conclude

about how levers work (in general) and your arm (specifically)

• Find an ulna among the bones and compare its MA (flexion) to yours. Niche/ecology conclusions?

• How accurate? Why?

Power vs.

Speed