- #1
gunblaze
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Think..
Can i ever make an object in vacumm and on a frictionless surface move with constant speed.. from rest?
Can i ever make an object in vacumm and on a frictionless surface move with constant speed.. from rest?
gunblaze said:So u mean by using photons, i can provide an opposing force on the accelerating object.. then as the resultant force on the ball reaches zero, i switch off the light.. the ball will move at constant speed.
But just another qn.. How long will this take?
gunblaze said:Yes. After shining the light, the body will accelerate.. but how by switching off the light can the object move with constant speed? the body will continue accelerate even with the light switched off since there is no opposing force on the object right?
Fe-56 said:hm, and what is mass
Pengwuino said:I think we can start off with defining that, very good.
Pengwuino said:It will continue moving at constant speed because all forces have equalized (ie. in this case, no forces exist) and acceleration only occurs when there is a net force.
By the way, since it is on topic, what is our best understanding as to why photons have momentum but no mass?
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