1. So theres no friction in space right? That means that if you say put enough force on an object like a tennis ball to go 10 mph it will continue going 10 mph forever right? Well what if you then put the exact same amount of force on it again does it go 20 mph? If thats the case then you could keep putting that exact amount of force on the object until it tries to go above 670,615,000 mph and relativity kicks in because nothing that isnt created going faster than the speed of light can ever excel to the speed of light right? You see where Im going with this? Sorry if thats kinda random

2.

3. Yes, It would then go 20.

4. Originally Posted by Elen
So theres no friction in space right? That means that if you say put enough force on an object like a tennis ball to go 10 mph it will continue going 10 mph forever right? Well what if you then put the exact same amount of force on it again does it go 20 mph? If thats the case then you could keep putting that exact amount of force on the object until it tries to go above 670,615,000 mph and relativity kicks in because nothing that isnt created going faster than the speed of light can ever excel to the speed of light right? You see where Im going with this? Sorry if thats kinda random
Actually, Relativity kicks in right away. If you exert a certain amount of effort to get the ball to go 10 mph, it will take just a tiny bit more effort than that again to get it to go 20 mph, and then a tiny bit more than that to get it to go 30 mph, etc. Each equal increase in speed will take more effort than the last increase. And the closer you get to the speed of light, the larger the increases in effort become.

5. Relativistically

where F is force, m<sub>0</sub> the rest mass of the object, a its acceleration, v its speed and c the speed of light. Which proves the point that as the objectâ€™s speed approaches that of light, the force required to maintain the objectâ€™s acceleration tends to infinity.

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