Table of Contents
Why would adding oil to the moving parts of a machine increases efficiency?
Why would adding oil to the moving parts of a machine increase its efficiency? It reduces the amount of friction, which lowers the total work input and increases the machines efficiency.
What affected the efficiency of the ramp How did it affect it?
As the ramp height increases, potential energy also increases. How does the level of friction affect the work needed to move the load? As friction increases, so does the amount of work. The more friction there is, the less efficient our machine is.
When a machine is used to do work the force applied by the machine is called the input force?
Work is a force exerted over some distance; therefore two forces are involved when a machine is used. The force exerted on a machine is called the input force, so the input work done on a machine is equal to the input force times the distance over which the input force is exerted.
What is the ideal mechanical advantage of a machine that changes only the direction of the input force?
Mechanical Advantage of Different Types of Machines
| Strength of Force | Distance Over which Force is Applied | Mechanical Advantage |
|---|---|---|
| increases | decreases | >1 |
| decreases | increases | <1 |
| stays the same (changes direction only) | stays the same | =1 |
What causes a machine to lose efficiency?
The two cases to decrease the efficiency of machine are friction produced in the machine and the tightness of the parts of the machine and also heat generated by the work done by the machine.
Does the use of grease affect the VR of a machine?
The grease does not affect the VR of a machine as grease reduces friction and the VR of a machine is not affected by friction.
Can a machine increase both force and distance explain why or why not?
NO! The work output can never be greater than the work input. How do machines decrease the amount of force needed to accomplish work? Machines apply force over a greater distance, so less force is needed.
Why is actual mechanical advantage of a machine always less than its ideal mechanical advantage?
The mechanical advantage of a machine is the number of times that the machine increases an input force. Because friction is always present, the actual mechanical advantage of a machine is always less than the ideal mechanical advantage.