The effort work is the effort force times the effort lever arm . The resistance work is the resistance force times the resistance lever arm. If we ignore any friction that occurs where the lever pivots over the fulcrum, this is an ideal machine. For ideal machines, effort work always equals resistance work.
How do you calculate effort force?
The effort force at a distance of 2 m from the fulcrum can be calculated as. F e = (1 kg) (9.81 m/s 2 ) (1 m) / (2 m) = 4.9 N . A lever mechanism where the input effort is higher than than the output load is often characterized as a third-class lever mechanism.
How do you find AMA?
The efficiency of a machine is equal to the ratio of its output (resistance multiplied by the distance it is moved) to its input (effort multiplied by the distance through which it is exerted); it is also equal to the ratio of the AMA to the IMA .
How do you find the resistance force of a lever?
In a class one lever the force of the effort (F e ) multiplied by the distance of the effort from the fulcrum (d e ) is equal to the force of the resistance (F r ) multiplied by the distance of the resistance from the fulcrum (d r ) . The effort and the resistance are on opposite sides of the fulcrum.
How do you find AMA efficiency?
The efficiency of a machine is equal to the ratio of its output (resistance multiplied by the distance it is moved) to its input (effort multiplied by the distance through which it is exerted); it is also equal to the ratio of the AMA to the IMA .
What is the difference between IMA and AMA in physics?
The AMA of a simple machine is the ratio of output to input forces. The IMA is the ratio of input distance to output distance .
What are two common types of resistance force?
The four main resistance forces are objects with mass, inertia, and momentum; friction; gravity; and air resistance. Objects with mass are able to provide resistance by colliding with other objects.
What is an example of resistance force?
Friction and fluid resistance are resistive forces when the material is stationary. ... For example, a boat moving through still water experiences the resistive force of water resistance. If the water is moving in the same direction as the boat is moving but at a slower speed, the force of the water resistance is reduced.
How do I calculate resistance?
If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I . For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance R T = 9 volts / 3 amps = 3 Ω.
Can a machine be more than 100% efficient no yes impossible to determine?
In other words, no machine can be more than 100% efficient. Machines cannot multiply energy or work input . ... If a machine were 100% efficient then it can’t have any energy losses to friction, so no friction can be present. In that case the theoretical and actual mechanical advantages would be equal.
What is the formula for efficiency?
Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula r=P/C , where P is the amount of useful output (“product”) produced per the amount C (“cost”) of resources consumed.
Are IMA and AMA equal?
Explanation: The Actual Mechanical Advantage AMA is equal to: ... The ideal mechanical advantage, IMA, is the same but in absence of FRICTION ! In this case you can use the concept known as CONSERVATION of ENERGY.
Why is no machine 100 percent efficient?
Explanation: No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). ... That is why 100% efficiency in machines shall not be possible .
What is ideal effort force?
In ideal machines, where there is no friction and the input work and output work are the same, (Effort Force)(Effort Distance)=(Resistance Force)(Resistance Distance. The effort is the work that you do. It is the amount of force you use times the distance over which you use it .
What are the 10 types of forces?
| Contact Forces Action-at-a-Distance Forces | Frictional Force Gravitational Force | Tension Force Electrical Force | Normal Force Magnetic Force | Air Resistance Force |
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