What is the mechanical disadvantage of a 2nd class lever?
When a lever’s load arm is longer than its effort arm, it is said to be at a mechanical disadvantage. It has a low load force to effort ratio. It cannot produce the same load force to effort ratio as a second class lever.
How does second class lever make our work easier?
Second class lever are the ones in which the load is located between fulcrum and the effort are called second-class or class two levers. They reduce our efforts that we put in to do a work, save energy and thereby make our life simpler. …
What do you mean by mechanical advantage of a lever is 3?
Answer: Ma of lever is 3 means that the applied effort can lift 3 times heavier load using the machine. N of the machine is 60% means that the total energy produced to the machine only 60% is useful and given as output. Explanation: Hope you like it.
What do you mean by mechanical advantage of a lever is 4?
Answer: The mechanical advantage of a machine is 4. Mechanical advantage MA is the ratio of output (generated by the machine) force to input (applied to the machine) force. So MA = 4 means that for example if you apply 100 N then your machine will multiply that force and generate 400 N.
What is MA and VR of lever?
Mechanical advantage (MA) = Load/Effort. Velocity ratio (VR) = distance effort moves/ distance load moves in the same time.
In which class lever VR is less than 1?
What is MA of a lever?
Definition 1: The fulcrum is the pivotal point where the lever rotates. Definition 2: The mechanical advantage (MA) is the factor by which a machine multiplies the force put into it. Definition 3: The effort arm represents where force is input. For the Lever: MA = length of effort arm ÷ length of resistance arm.
Why Ma is always less than VR?
The mechanical advantage (M.A) of a real machine is always less than its velocity ratio(V.R) because mechanical advantage decreases due to the friction and weight of moving parts of the machine whereas the velocity ratio remains constant.
Why VR is not affected by friction?
VR is velocity ratio . Velocity ratio is the ratio of displacement of effort to load . Here the displacement takes place. Friction cannot reduce the displacement as it is only a force which is of opposing nature and thus VR is unaffected by friction.
Why velocity ratio is not affected by friction?
Answer. Answer: Explanation:because it is the ratio of distance, which is not affected by friction.
Why is the efficiency of a machine never 100%?
A machine cannot be 100 percent efficient because output of a machine is always less than input. A certain amount of work done on a machine is lost to overcome friction and to lift some moving parts of the machine.