What is the relationship between force (in lbs) and speed?

In summary, the conversation discusses finding the rough speed of an object's movement when a certain amount of force is applied to it. The formula F=ma is mentioned, which relates the force applied to the object to its acceleration. It is also mentioned that in the U.S. system of measurement, the weight of the object must be converted to mass units before calculating acceleration. The equations of motion are also mentioned as a way to calculate final velocity when acceleration is constant.
  • #36
Dr.D said:
Regarding "weight" expressed in kilograms, it is NOT TRUE that 1 kilogram is 1 kilogram * 1 meter/s^2, so this is an inconsistent usage. It is essentially the same mistake made by expressing both force and mass in pounds, only reversed. Who is to say they are more interested in their mass than in their weight? Are they more interested in the pull of the Earth on their bodies and the resultant ache in their ankles and the soles of their feet? Or are they really thinking about how their momentum will be affected in a collision?

I beg to differ with what you are saying.

Firstly, you are saying that the SI system is arbitrary due to the usage of fudge factors to quantify and make sense of the units. This logic is inherently flawed since everything we observe about the universe is then a fudge factor. We make sense of different things with prefixes and units, because there is no universal system to make everything magically work. The US system and SI system are equally as arbitrary and useless as each other, but if the SI system is easier to use, then let us use it.

Secondly, these so called "inconsistencies" are not a product of the SI system, but a misconception created by the common public without any technical understanding. From a purely technical point of view, I understand the differences in weight and mass, and I'm sure anyone on this forum definitely does. If somebody doesn't, it isn't a fault in the SI system, it is a fault of the people and their linguistic assumptions.

Any units system is a construct of our imagination. This is the way humans understand the world. If one of the methods is easy to convert with, regardless of it's fudge factors, why shouldn't we use it?
 
<h2>1. What is force?</h2><p>Force is a physical quantity that describes the interaction between two objects. It is measured in pounds (lbs) in the imperial system and in Newtons (N) in the metric system.</p><h2>2. How is force related to speed?</h2><p>Force and speed are directly proportional to each other. This means that as force increases, speed also increases. The greater the force applied to an object, the faster it will move.</p><h2>3. What is the formula for calculating force?</h2><p>The formula for force is F = m x a, where F is the force in Newtons, m is the mass of the object in kilograms, and a is the acceleration in meters per second squared.</p><h2>4. Can force affect the direction of an object's motion?</h2><p>Yes, force can affect the direction of an object's motion. This is known as a change in velocity, which is caused by a force acting in a direction other than the object's initial motion.</p><h2>5. How does friction affect the relationship between force and speed?</h2><p>Friction is a force that opposes motion and can decrease the speed of an object. This means that the relationship between force and speed is affected by friction, as the force needed to overcome friction will also need to be factored in when determining the resulting speed.</p>

1. What is force?

Force is a physical quantity that describes the interaction between two objects. It is measured in pounds (lbs) in the imperial system and in Newtons (N) in the metric system.

2. How is force related to speed?

Force and speed are directly proportional to each other. This means that as force increases, speed also increases. The greater the force applied to an object, the faster it will move.

3. What is the formula for calculating force?

The formula for force is F = m x a, where F is the force in Newtons, m is the mass of the object in kilograms, and a is the acceleration in meters per second squared.

4. Can force affect the direction of an object's motion?

Yes, force can affect the direction of an object's motion. This is known as a change in velocity, which is caused by a force acting in a direction other than the object's initial motion.

5. How does friction affect the relationship between force and speed?

Friction is a force that opposes motion and can decrease the speed of an object. This means that the relationship between force and speed is affected by friction, as the force needed to overcome friction will also need to be factored in when determining the resulting speed.

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