Understanding Levers in Science

Which of the following is a characteristic of a first class lever?

• The effort is always between the fulcrum and the load

• The fulcrum is between the effort and the load

• The load is always between the fulcrum and the effort

• There is no fulcrum in a first class lever

Which of the following is an example of a second class lever?

• Scissors

• Wheelbarrow

• Fishing rod

• Tweezers

In a third class lever, where is the effort applied?

• Between the fulcrum and the load

• At the fulcrum

• At the load

• On the opposite side of the fulcrum from the load

Which of the following is a real-life example of a first class lever?

• Nutcracker

• Seesaw

• Wheelbarrow

• Stapler

What is the mechanical advantage (MA) of a lever if the effort arm is 2 metres and the load arm is 0.5 metres?

• 0.25

• 1

• 2

• 4

Which of the following statements is true about second class levers?

• The fulcrum is between the effort and the load

• The load is between the fulcrum and the effort

• The effort is between the fulcrum and the load

• The load and effort are on the same side of the fulcrum

Which of the following is NOT a third class lever?

• Human forearm lifting a weight

• Fishing rod

• Tongs

• Crowbar

Which of the following is a real-life example of a third class lever?

• Crowbar

• Nutcracker

• Broom

• Pliers

If a lever has a mechanical advantage less than 1, what does this mean?

• The lever increases force

• The lever increases speed or distance

• The lever is not a simple machine

• The lever cannot be used

Which of the following is a first class lever found in the human body?

• Elbow joint when lifting a weight

• Neck joint when nodding the head

• Ankle joint when standing on tiptoes

• Knee joint when kicking a ball