# Tag Info

Accepted

### Why does work depend on distance?

You have to put in the distance on which the force acts. If you release the force, there will be no work done since there is no force acting on the body.
• 1,001
Accepted

### If work is a scalar measurement, why do we sometimes represent it as the product of force (a vector) and distance (scalar)?

Work is the dot product of a vector force and a vector displacement, hence a scalar. Knowing just the scalar distance isn’t enough to calculate work. That distance might be in the same direction as ...
• 14.5k

### Why does work depend on distance?

Often it is important to know if a given formula is a simplification of a more general equation and, when you encounter a conceptual problem, check the general formula. In this case it is a ...
• 103k
Accepted

### Why isn't the GPS location calculated from the Schwarzschild metric?

The general-relativistic corrections are too small to matter. The Schwarzchild metric has dimensionless corrections of order $GM/rc^2$. Here $G$ is the Newton's gravitational constant, $M$ the mass ...
• 51.7k
Accepted

### Why is the work done by a rocket engine greater at higher speeds?

The key point of this question is that it intuitively seems like conservation of energy is not working right. A rocket is powered by a chemical reaction that releases chemical energy at a constant ...
• 103k
Accepted

### Is a light year a different distance if measured from a moving object?

The distance light travels in a given period is the same for every observer. That's the whole point of relativity. You can figure out for yourself almost all the effects predicted by relativity if ...
• 26.4k