Understanding Car Motion and Distance: A Quick Physics Question Answered

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In summary, speed is a scalar measure of the magnitude of velocity, which is a vector quantity that includes both magnitude and direction.
  • #1
godkills
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When a car starts up from rest and then 4 seconds later it comes to a rest again; is there motion after the 4 seconds? Is there Distance if so can it be calculated and how graphically?


Well my common sense is telling me no because when a car starts up there is motion and while there is motion it is making a distance because it is traveling.

So when a car stops it is not making any distance at all and it has no motion.
 
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  • #2
That sounds perfectly correct. Do you have any reason to think that is incorrect?

That is the meaning of "motion" in English, changing position.
 
  • #3
No, I am just starting to learn physics in school also one more question, Is velocity speed?

I am getting some conflicts when I am doing problems in the textbook where some times you use the speed as velocity in some equations. Where you use the term v as speed? And I may know that sometimes using x can sometimes define velocity. Or all the letters are just representing something more specific meaning that sometimes it can be defined as (y) and then sometimes it can be defined as (z)

My instructor explained on the first day saying that speed is a scalar and velocity is a vector.

And when I Google by definition it defines velocity as speed?

also just to ensure my understanding v subscript 0 and v itself defines as velocity always?
 
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  • #4
vectors have magnitude and direction, whereas scalars only have direction, so velocity is speed with direction

v0 is initial velocity
 
  • #5
So speed is a vector and it is velocity correct?
 
  • #6
no -- speed is a scalar and velocity is a vector

speed does not equal velocity though

examples of speed could be: 1 m/s, 8 m/s
examples of velocity could be: +1 m/s, -8 m/s

in terms of physics, it's incorrect to say that speed is velocity, just as it is incorrect to say that 8 m/s = -8 m/s

the magnitude of velocity, however, is speed
ie, the magnitude of -8 m/s is its absolute value, which is just 8 m/s
 
  • #7
Ahh you have caught me, So magnitude is speed and magnitude belongs to the scalar category.

Magnitude in measurements is always positive because speed is never negative.

That sound correct?
 
  • #8
bump?
 
  • #9
As stated, velocity is a vector quantity -- it has magnitude and direction. Speed is the magnitude of velocity, and is therefore a non-negative scalar.
 

1. What is "Quick Simple Physics Question"?

"Quick Simple Physics Question" is a phrase often used to describe a basic or fundamental physics concept or problem that can be quickly explained or solved.

2. Why is understanding basic physics important?

Understanding basic physics is important because it helps us to make sense of the world around us. It allows us to explain and predict the behavior of objects, energy, and forces, from the motion of everyday objects to the laws of the universe.

3. Can you give an example of a "Quick Simple Physics Question"?

An example of a "Quick Simple Physics Question" could be: "If a car is traveling at a constant speed of 60 miles per hour, how far will it travel in 2 hours?" This question involves the basic concept of speed (distance traveled over time) and can be solved using the equation distance = speed x time.

4. How can I improve my understanding of basic physics?

To improve your understanding of basic physics, it is important to practice problem-solving and critical thinking skills. You can also read textbooks, watch educational videos, or attend lectures or workshops on physics topics. It can also be helpful to work with a tutor or join a study group to discuss and work through difficult concepts.

5. Is physics only relevant to scientists and engineers?

No, physics is relevant to everyone! While scientists and engineers may use physics principles to develop new technologies and innovations, understanding basic physics can also help in everyday life. For example, knowing the principles of motion can help you understand how to safely operate a car, and understanding energy can help you make more informed decisions about energy consumption in your home.

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