Efficiency is :
MA x VR
Raising the weight of the body on toes is an example for:
Class I lever
Class II lever
Class III lever
None of these
Nodding action of head is an example of :
Raising a load by forearm is an example for:
The ideal mechanical advantage of lever in which the effort arm is 50 cm and load arm is 5 is
10
5
6
7
Which type of lever is this?
Class I
Class II
Class III
Nothing can said
Class I lever is that in which
fulcrum is between the load and effort
load is between the fulcrum and effort
effort is between the load and fulcrum
fulcrum , load and effort are at one point
The correct relationship between the voltage ratio (VR) distance moved by load (dL) and distance moved by effort (dE) is.
VR = dL + dt
VR = dE x dL
Class II levers are designed to have:
MA = VR
MA > VR
MA > 1
MA < 1
A single fixed pulley is used because it
has a mechanical advantage greater than 1
has a velocity ratio less than 1
gives 100% efficiency
helps to apply the effort in a convenient direction
