Because you need to specify the DIRECTION in which you move.
If I tell you that it is 5 miles to the station, I also need to tell you which way to go 5 miles. (If the station was due north and you headed due south you might miss your train!)
It's not necessary at all. But the fact that it can be usedas a navigational tool makes it quite useful.
compass needle?
An example of a parallel motion linkage is a tool box that opens with multiple shelves.
A camera and a microscope are two devices that meet your criteria.
Momentum is defined as the "Mass in Motion". It is a Vector quantity. It depends on two variables (Object Mass and Velocity) . Its direction is same as objects velocity direction. In physics momentum is required to specify the motion of the object . If two bodies of same masses having different velocities have different momentum , in a similar way bodies of different masses having same velocity have different momentum. So , in order to describe the motion of object clearly one of the tool in classical mechanics is momentum
I'm gonna have to say no. A compass is used to determine direction.
Horse Isle - Compass
A compass pendant is a popular decoration that also serves a navigation function. Rather than carrying around a separate compass, a pendant is crafted from a useful tool and worn.
It's not necessary at all. But the fact that it can be usedas a navigational tool makes it quite useful.
No. A compass is a useful tool on Earth because the needle aligns with Earth's magnetic field and we know the shape of that field. There would be no such field in outer space.
The magnetic needles of the compass align with earths magnetic field coming off the polar ice cap.
compass
Compass compass compass
A compass is the tool.
compass needle?
Most of the time, a tool called a "compass" is used to draw perfect circles. This compass is not to be mistaken with a directional compass.
A navigational tool with a needle is a compass because it helps you to navigate which is cosidered as a tool. A compass has a needle inside to point which way is north. There is your answer :)