# I Mass given velocity only?

1. May 2, 2017

### John Clement Husain

Is it possible to find the mass without force/density/momentum but with velocity only?

2. May 2, 2017

### PeroK

You mean, for example, if something is moving at $1m/s$ then it must have a mass of $7.4kg$?

3. May 2, 2017

### John Clement Husain

something like this:
An object, with a distance of 1300 km, in space is moving in 100 km in 10 s towards Earth, find it's mass.

4. May 2, 2017

### PeroK

Why would that determine its mass? Why couldn't a small object (a rock) and a large object (an asteroid) be moving at the same speed?

In particular, all objects are affected by gravity to the same extent. Their trajectories or orbits do not depend on their mass.

You could, however, estimate the mass of the Earth from looking at the orbits of things moving around it or things falling towards it.

5. May 2, 2017

nope

6. May 2, 2017

### John Clement Husain

you mean Kepler's Third law?

7. May 2, 2017

### PeroK

More fundamentally the acceleration of gravity is independent of the accelerated mass.

8. May 2, 2017

### sophiecentaur

How would that tie in with Newton's Laws of motion?