It measures the actual speed of the car at the time
instantaneous speed. =)
It reads the instantaneous speed.If you have noticed that the speedometer needle drops and rises with the drop and rise with the cars speed.
Speedometers measure instantaneous speed.
To be pedantic... In a car with a digital speedometer, speed is NOT instantaneous in the sense that it is a measure of distance per unit time. It does this by measuring a change in distance over a very short period of time to *approximate* the instantaneous speed. If the time period is a small fraction of a second you wouldn't know the difference! For older cars with analog speedometers the speed is instantaneous as it directly translates the speed at which your wheels are turning.
The average speed of the vehicle relative to the road.
On the speedometer, no. It will indicate a speed but it will not be accurate.
The speed should read fine with a GM speedometer, as the 110 and 150 are calibrated to go into the same cars with the same transmissions.
A car has a speedometer. When you read the speed that it indicates, and you know the direction in which you're driving, then you know the car's velocity.
The speed you are travelling measured in miles per hour, or kilometers per hour, depending on where you live.
Instantaneous velocity:Suppose the velocity of the car is varying, because for example, you're in a traffic jam. You look at the speedometer and it's varying a lot, all the way from zero to 60 mph. What is the instantaneous velocity? It is, more or less, what you read on the speedometer. I'm assuming you've got a good speedometer that isn't too sluggish and can change its reading quite quickly. Your speedometer is measuring the the average velocity but one measured over quite a short time, to ensure that you're getting an up to date reading of your velocity.So if you measure the displacement of the car over a time , you can use that to determine the average velocity of the car. What we want is to take the limit as goes to zero.Most of the time we'll be working with instantaneous velocity, so we'll just drop the instantaneous, and call the above vthe velocity.To justify that such a limit exists is something that you've hopefully had to grapple with already. For physics problems, this limit does indeed exist and gives the derivative
The top speed is 128mph (2006 EX sedan). The speedometer would probably read 130. I drove it at 202 Kmp/h
check if it has a speedometer cable if not the speed sensor needs to be replaced
Your alignment on the speedometer cable is off. This happens a lot on older Geos. Take it to a mechanic and have them speed test it and re fit it.
Larger tires will make the speedo lower than actual speed.
The speedometer in a car runs based off the speed of the transmission. The gears in the transmission spin at a known rate for the speed the vehicle is traveling at. The faster the gears spin the more the speedometer goes up. If a person replaces stock tires with larger tires, then the tires will spin slower, which will cause the speedometer to read at a value that is less than the actual speed.
VSS ( Vehical Speed Sensor ) located on your transmission
Speed sensor...on the passenger side of the tranny where the axle enters the transmission.
Speedometers are not allowed by law to under-read, but are allowed to over-read by no more than 10%. So at a true 30mph, they can legally read anything between 30mph and 33mph. Because they read the speed via a sensor in the transmission, not the true speed of the vehicle across the ground, they have to be calibrated such that they under-read slightly when the vehicle is lightly laden and has brand new tyres fully inflated. As the tyres wear, and if they are slightly under-inflated, or compressed by a greater load in the vehicle, the speedometer will over-read by more.
If during that entire period of time the speedometer read 60, then the speed was constant in your relative inertial reference frame
I'am not sure about your vehicle, but most have a cable that runs from your speedometer to the transmission. speed is read by a gear that spins the cable. most of the time the cable is simply broken and is pretty easy to replace. if you have a digital speedometer it is usually a simple two wire cord that runs from the side of trasnsmission to speedometer. either way speed is read off the transmission on my 93 f-150 the speedometer sensor is on the third member of the rear end. I have a 1995 F150 5.8 auto 4x4. My speed sensor is on the tail shaft of the transfer case.
The size of tires can effect that accuracy of a speedometer. Larger tires will cause the speedometer to read less than you are actually going.