What reduces the efficiency of a machine?
What reduces the efficiency of a machine?
Friction reduces efficiency because when two surfaces slide past each other, friction resists their motion, and in real machines, some input work is always used to overcome friction..
What is impossible for a machine?
What is impossible for a machine to do? It can apply a force to an object in a different direction than the force applied to the machine. It can increase the distance through which a force acts by exerting less force than was used on it.
What are three ways we can increase a machine’s efficiency by reducing friction?
Three ways are you can increase the force, increase the distance of the force, and change the direction of the force. Why can’t you get more work out of a machine than you put into it? Explain why machines are not 100% efficient. Because all machines must use some of the work put into them ot overcome friction.
Can a machine increase work?
Contrary to popular belief, machines do not increase the amount of work that is done. They just change how the work is done. Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied.
How is friction reduced?
By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.
Can a machine increase both force and distance?
No machine can increase both the magnitude and the distance of a force at the same time. A lever is a rigid bar that rotates around a fixed point called the fulcrum.
What is the mechanical advantage of a machine that only changes direction?
Science test
| A | B |
|---|---|
| The amount by which a machine multiplies an effort force is called the _____. | mechanical advantage |
| An inclined plane with one or two sloping sides forms a machine called a _____. | wedge |
| A machine that changes only the direction of a force has a mechanical advantage of _____. | 1 |
| The unit of power is the _____. | watt |
When two or more simple machines work together?
Compound Machine: Two or more simple machines working together to make work easier.
What type of simple machine is a door stop?
wedge
What is a grooved wheel with a rope wrapped around it?
pulley. a grooved wheel with a rope wrapped around it. compound machine.
Why is a wheel and axle useful?
Wheel and axle, basic machine component for amplifying force. In its earliest form it was probably used for raising weights or water buckets from wells. Its principle of operation is demonstrated by the large and small gears attached to the same shaft, as shown at A in the illustration.