velocity

[Primarygun]

If two object with same mass, over the ground at the same height, are pushed horizontally. But the force applied are different,say for object A , the x-velocity is 10m/s but for B is 20m/s?

The time for them reaching the ground is the same.

I want to question about what will be observed if one is with speed of light and the other is a very low speed. Will the observation change if the first object's speed is not c but near to c?

[swansont]

velocity and force are vectors. The x-motion and y-motion are independent. So no matter what you do in x, the y motion is unaffected.

[Guest ajmmacleod]

If you give something an extreme x volocity (horizontal to the earth), by the time gravity pulls it down enough towards the earth, the item will have moved far enough in the x direction, that it won't hit the ground, due to the earth being round. If the item moves fast enough, the earth will effectively 'fall away' and there will be no ground for it to hit.

 

If you get the exact right speed, the item will stay in this orbit around the earth. This is how satellites work. If you go faster than the speed to make it orbit, it will move further from the earth, and opposite to that, if you slow it down, it will move closer to the earth, and if slow enough, it will collide with the earth.

 

As for the speed of light question. The item would just be sent streight into orbit, because of the sheer amount of force, gravity wont have much of a bearing.

 

You'll find attached to my post 2 really quick drawings of this. Orbit.jpg is if you give an item the right orbit speed, and Light.jpg if you gave it the speed of light.

 

Give us a yell if you have any problems understanding (not the worlds best explination),

Cheers,

Adam