Understanding Levers and Moments

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

• The fulcrum is located between the effort and the load.

• The load is located between the fulcrum and the effort.

• The effort is located between the fulcrum and the load.

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

What is the principle of moments?

• The sum of the clockwise moments equals the sum of the anticlockwise moments about a pivot.

• The sum of the forces equals zero.

• The product of the force and distance is constant.

• The total energy in a system remains constant.

How is torque calculated?

• Torque = Force × Distance

• Torque = Mass × Acceleration

• Torque = Force / Distance

• Torque = Mass × Velocity

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

• Scissors

• Wheelbarrow

• Tweezers

• Fishing rod

What is the mechanical advantage of a lever?

• The ratio of the load force to the effort force.

• The ratio of the effort force to the load force.

• The sum of the load force and the effort force.

• The difference between the load force and the effort force.

In which type of lever is the effort applied between the fulcrum and the load?

• First-class lever

• Second-class lever

• Third-class lever

• Fourth-class lever

If a lever has a mechanical advantage of 4, what does this mean?

• The effort force is four times greater than the load force.

• The load force is four times greater than the effort force.

• The lever is four times longer than the load.

• The lever is four times shorter than the load.

Which of the following is an application of levers in everyday life?

• A seesaw

• A bicycle

• A pulley

• A spring

What is the unit of torque in the International System of Units (SI)?

• Newton

• Joule

• Newton-metre

• Watt

Which of the following statements is true about a third-class lever?

• It always provides a mechanical advantage greater than 1.

• It always provides a mechanical advantage less than 1.

• It always provides a mechanical advantage equal to 1.

• It does not provide any mechanical advantage.