Class-2

second

Describe a third class lever. The effort force lies closer to the axis of the lever than the resistance, and the force arm is smaller than the resistance arm. Where is the fulcrum in a third class lever? In a third class lever the fulcrum is again at the end, but the effort is in the middle.

ex. baseball bat In this, the input force is applied between the output force and the fulcrum. The output force is always less than the input force in this. Instead, the distance over which the output force is applied is increased.

For machines that increase force — including ramps, doorknobs, and nutcrackers — the output force is greater than the input force. Therefore, the mechanical advantage is greater than 1.Ordibehesht 1, 1391 AP

Mechanical advantage is how much a machine changes the input force. 2. Mechanical advantage can be calculated as the ratio of the output force to the input force of a machine.

Simple Machines | Short/Long Answer Questions Work input is work done on a machine to get the desired output. Work output is the amount of desired work that is done by a machine. For an ideal machine, the work output is equal to the work input i.e the efficiency is 1.

It will be necessary to determine force when you want to calculate the work input in a pulley or a system of pulleys. Work is determined by multiplying force by distance traveled: Work (W) = Force (F)X Distance (d) W=Fd.

A pulley is a simple machine made of a grooved wheel with a rope or cable wrapped around it, as shown below. You use a pulley by pulling on one end of the rope. The force of your pull is the input force. At the other end of the rope, the output force pulls up on the object you want to move.

What is the difference between the input force and output force? Input- force you exert on a machine, output- force exerted by a machine. Output- the distance the output force is exerted through.

This force is called the input force. A wheel and axle does not change the direction of the input force. However, the force put out by the machine, called the output force, is either greater than the input force or else applied over a greater distance.

In order to calculate the mechanical advantage of a wheel and axel, you can divide the radius of the wheel by the radius of the axle. If a wheel’s radius is 60cm and its axle is 30cm, what is the mechanical advantage of the wheel and axle? The output force of the wheel and axle is 2 times greater than the input force.

The wheel and axle consists of a round disk, known as a wheel, with a rod through the centre of it, known as the axle. This system uses angular momentum and torque to do work on objects, typically against the force of gravity. The wheel and axle simple machine is closely related to gears.

wheels and axles in cars Because car wheels are circular, the car remains at a constant height over the ground as it moves forward. The driveshaft within a car is a wheel and axle system.