Advertisements
Advertisements
Question
Define the term velocity ratio.
Advertisements
Solution
The ratio of the velocity of effort to the velocity of the load is called the velocity ratio of the machine.
Velocity ratio (V.R.) = `("Velocity of effort" ("V"_"E"))/("Velocity of load" ("V"_"L"))`
RELATED QUESTIONS
Explain the term mechanical advantage.
When does a machine act as (a) a force multiplier, (b) a speed multiplier? Can a machine act as a force multiplier and a speed multiplier simultaneously?
How is the mechanical advantage related with the velocity ratio for an actual machine? State whether the efficiency of such a machine is equal to 1, less than 1 or more than 1.
Draw diagrams to illustrate the position of fulcrum load and effort, in the following:
A seesaw
Draw a diagram to illustrate the position of fulcrum load and effort, in the following:
A common balance
Draw a diagram to illustrate the position of fulcrum load and effort, in the following:
A nut cracker
Draw a diagram to illustrate the position of fulcrum load and effort, in the following:
Forceps
A fire tongs has arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at a distance 15 cm from the fulcrum. Find:
- the mechanical advantage of fire tongs and
- the effort needed.
In class II lever, effort arm is ______ than the load arm.
Mechanical advantage = ______ × velocity ratio.
