The correct answer is 3. the machine loses 20% of the input.
Efficiency is defined as the ratio of useful output work to the total input work. It's expressed as a percentage.
If a machine has an efficiency of 80%, this means that 80% of the input energy is converted into useful output work. The remaining 20% is lost due to factors like friction, heat, and sound.
Let's examine why the other options are incorrect:
- Option 1: Velocity ratio and mechanical advantage are related to the machine's capabilities but don't directly define its efficiency. Efficiency focuses on energy conversion.
- Option 2: An 80% efficient machine *does* have losses in input energy; that's what the 20% represents.
- Option 4: A machine can never produce more output energy than the input energy due to the law of conservation of energy. This would imply a greater than 100% efficiency, which is impossible.
Therefore, an 80% efficiency indicates a 20% energy loss during the work process.
Similar Questions
Find the efficiency of a pulley system which has a mechanical advantage of 2.5 and where the load lifts by 2.5 meters on pulling the rope by 10 m.
- An effort of 5 units is applied on a 10-unit load. The distance travelled by the effort and the load are 50 and 20 units, respectively. Find the efficiency of this machine.
- The force applied to overcome a load is called _____.
- In practice, the work output of a machine is _____ the work input due to the effect of friction.
- The efficiency of a machine can never be _____.
- An effort of 5 units is applied on a 10-unit load. The distance travelled by the effort and the load are 50 and 20 units, respectively. Find the efficiency of this machine.
The effort applied to move a load is 15 units and the mechanical advantage is observed to be 3. Find the load.
The velocity ratio of a simple machine is the ratio of distance traveled by the ________ to the distance traveled by the ________ in the machine.
Important Questions from Mechanical Advantage
Find the efficiency of a pulley system which has a mechanical advantage of 2.5 and where the load lifts by 2.5 meters on pulling the rope by 10 m.
- An effort of 5 units is applied on a 10-unit load. The distance travelled by the effort and the load are 50 and 20 units, respectively. Find the efficiency of this machine.
- The force applied to overcome a load is called _____.
- In practice, the work output of a machine is _____ the work input due to the effect of friction.
- The efficiency of a machine can never be _____.
