Question

Third class levers act as speed multipliers.
A).Yes
B).No

Answer 1

Hint: in this question we will know the basics of lever and types of lever. Also, we will discuss the basics of third class lever, which will help to get the required answer to our question. At last we will discuss energy and the law of conservation of energy.

Complete answer:
As we know that, a lever is a machine, it consists of a bar or plane pivoting on a fulcrum. There are three main parts of a lever that are: the load, the fulcrum and the last on called effort. Here, load is the object that is to be moved, fulcrum is the point at which the lever pivots and effort is the actually the force that is used to move the lever.
Here, there are three classes of lever.
Third class levers are different from first and second class levers as here, instead of force multipliers, third class levers are speed multipliers.
In the third class of lever the effort or force is between the load and fulcrum. So, it shows the third class levers do not provide a mechanical advantage and more force is required in a third class lever to move an object. Examples of third class levers are: fishing rods, cricket bats and chopsticks.
These third class levers are used in applications where speed is necessary, because large force is applied by the effort and so, the load travels a further distance. Now, as the load travels a further distance, its speed is also multiplied.
Therefore, option A) is correct i.e., third class levers act as speed multipliers.
Additional information: here we should know that levers work under the principle of conservation of energy. As we know that energy is defined as the ability to do work. Energy can be found in many things and can take different forms, like-kinetic energy is the energy of motion, and potential energy is energy due to an object's position or structure. Total energy of a system is given by the sum of kinetic energy and potential energy.
We also know that, according to the law of conservation of energy, energy can neither be created nor be destroyed; rather it can only be transferred from one form to another. Here, in this question electrical energy is transferred to heat energy.
We should also know about the power. It is the amount of energy transferred or converted per unit time. In the International System or S.I Unit of power is the watt. The S.I unit of power can also be written as one joule per second. Power is a scalar quantity, which means it has only magnitude not direction.

Note:
We should remember that the laws of conservation of energy can never be violated in any case. According to the law of conservation of energy, energy can neither be created nor be destroyed; rather it can only be transferred from one form to another.