Levers and Pulleys

Levers and Pulleys

Multiple Choice

Every type of simple machine has its own equation to calculate IMA, but what is the generic equation to calculate mechanical advantage?

• 
  

  $MA=F_{in}\cdot F_{out}$
  

• $MA=\frac{F_{in}}{F_{out}}$

• $MA=\frac{F_{out}}{F_{in}}$

Multiple Choice

Your limbs can be considered biological levers.

What do you think most makes sense as the fulcrum of your body-levers?

• Joints (elbow, shoulder, knee)

• Long bones (ulna, femur)

• Muscles

Multiple Choice

What type of lever are scissors?

• 1st Class

• 2nd Class

• 3rd Class

Multiple Choice

What type of lever is a nutcracker (like the one pictured)?

• 1st class

• 2nd class

• 3rd class

Multiple Choice

What type of lever will ALWAYS have an IMA greater than 1?

• 1st class

• 2nd class

• 3rd class

Multiple Choice

How much force do you need to pull with to lift a 100 N box using a movable pulley?

• 200 N

• 100 N

• 50 N

Poll

Which type of machine do you expect to be MORE affected by friction?

• pulley

• lever