A lever can act as a force multiplier and speed multiplier simultaneously.
A lever can act as a force multiplier and speed multiplier simultaneously.
The correct option is B False
The ratio of effort arm to load arm is termed as the mechanical advantage (MA) of a machine.
Velocity ratio of a machine is defined as the ratio of velocity of the effort to the velocity of the load.
For an ideal system, mechanical advantage = velocity ratio = 1
For class II lever, the load acts in the middle, fulcrum at one end and effort at the other end.
So, effort arm > load arm, MA and VR are always greater than one, hence acts as a force multiplier.
For class III lever, effort acts in the middle and the load and fulcrum are at the endpoints.
So, effort arm < load arm, MA and VR are always less than one.
Since velocity ratio is one, so the velocity of effort is less than the velocity of the load. Hence it acts as a speed multiplier.
A machine cannot act as a force multiplier and a speed multiplier simultaneously because for speed multiplier, MA of the machine should be less than 1 and for force multiplier, MA should be greater than 1.
False
The ratio of effort arm to load arm is termed as the mechanical advantage (MA) of a machine.
Velocity ratio of a machine is defined as the ratio of velocity of the effort to the velocity of the load.
For an ideal system, mechanical advantage = velocity ratio = 1
For class II lever, the load acts in the middle, fulcrum at one end and effort at the other end.
So, effort arm > load arm, MA and VR are always greater than one, hence acts as a force multiplier.
For class III lever, effort acts in the middle and the load and fulcrum are at the endpoints.
So, effort arm < load arm, MA and VR are always less than one.
Since velocity ratio is one, so the velocity of effort is less than the velocity of the load. Hence it acts as a speed multiplier.
A machine cannot act as a force multiplier and a speed multiplier simultaneously because for speed multiplier, MA of the machine should be less than 1 and for force multiplier, MA should be greater than 1.
