What is velocity ratio formula?

The velocity ratio (V.R.) of a machine is the ratio of distance moved by the effort to distance moved by the load. Formula – Velocity Ratio = Distance moved by the effort / Distance moved by the load = y/x. The velocity of given machine can also be determined by assuming the machine to be ideal.

What is velocity ratio?

Definition of velocity ratio : the ratio of a distance through which any part of a machine moves to that which the driving part moves during the same time.

Why is velocity ratio?

Velocity ratio of simple machine is the ratio of distance travelled by the effort to the distance travelled by load in a machine. The efficiency of a simple machine is defined as the ratio of useful work done by machine (output work) to the total work put into the machine (input work).

What is the velocity ratio of gears?

Velocity ratio: The ratio of the number of revolutions of the driving (or input) gear to the number of revolutions of the driven (or output) gear, in a unit of time. Pitch point: The point of tangency of the pitch circles of a pair of mating gears.

What is velocity ratio Class 9?

velocity ratio is The ratio of the distance moved by the point at which the effort is applied in a simple machine to the distance moved by the point at which the load is applied, in the same time. Velocity ratio is sometimes called distance ratio.

What is velocity ratio of a lever?

Velocity ratio (VR) is the ratio of the lengths of out-lever to in-lever (length of resistance arm/effort arm). To increase the velocity ratio that the load is moved, increase the resistance arm by moving the fulcrum closer to the effort. The higher the VR, the greater the speed of the lever.

Is velocity ratio same as gear ratio?

The reason bicycles are easier to cycle up a hill when the gears are changed is due to what is called Gear Ratio (velocity ratio). Basically, the ratio is determined by the number of teeth on each gear wheel, the chain is ignored and does no enter the equation.

What is high velocity ratio?

…to output motions is the velocity ratio (VR), and it defines the motion-modifying function. When the efficiency is high, these ratios are approximately equal; if the output force is 10 times the input force, the input motion must be 10 times the output motion; i.e., what is gained in force…

What do you mean by Ma and VR define them?

Mechanical advantage: The ratio between load and effort is called mechanical advantage M.A.: M.A. Velocity ratio: The ratio between displacement of effort and displacement of load is calledVelocity ratio V.R.: V. R. = dE/dLWhere dE and dL are the displacement of effort and load respectively in time t.

How do you find the velocity ratio of a pulley?

Example

1. Velocity ratio = diameter of the driven pulley ÷ diameter of the driver pulley.
2. The smaller driver pulley turns ten times for every one turn of the driven pulley.
3. Output speed = input speed ÷ velocity ratio.
4. The smaller driven pulley will turn at 3,000 rpm.

Why velocity ratio has no unit?

Velocity ratio of simple machine is the ratio of distance travelled by the effort to the distance travelled by theload in the machine. As velocity ratio or ideal mechanical advantage is a simple ratio of two distances, it also does not have the unit. The friction is not involved in it.

What is the velocity ratio of pulley?

2
The velocity ratio of a single moveable pulley is always 2.