Levers

An example of a lever is

• pulley

• bicycle

• tongs

• screw

Which of the following machines are levers?

• 
• 
• 
• 
• All of the above

Which of the following machine is not a lever?

• 
• 
• 
• 

The pivot point of a lever is called the

• load

• effort

• fulcrum

• none of the above

An ideal lever has efficiency

• 90%

• 100%

• 200%

• 99%

Principle of moments states that

• Anticlockwise moment = Clockwise moment

• Anticlockwise moment > Clockwise moment

• Anticlockwise moment < Clockwise moment

• Anticlockwise moment < or = Clockwise moment

Mechanical Advantage of a lever is

• ratio of the load arm to the effort arm

• ratio of the effort arm to the load arm

• ratio of the load to the effort

• ratio of the fulcrum to the load

A machine with M.A. < 1 is used as a:

• convenient direction changer

• force multiplier

• speed multiplier

• load multiplier

For a lever to be a first class lever the fulcrum needs to be

• between the load and the effort

• on one side and the load and effort on the other side

• on the same side as load

• on same side as effort

An example of a second class lever is the

• scissors

• Wheelbarrow

• Hammer

• Tongs