![]() A spinning spacecraft does essentially the same thing. ![]() Every time you turn your car, you can feel the forces on you that go along with this circular acceleration. Moving in a circle means you have to accelerate. If you just move in a circle (at a constant speed), you will change direction all the time and be accelerating. Since velocity is a vector, changing either the magnitude or the direction of the velocity will result in an acceleration. The acceleration depends on the change in velocity. There is another way to have an acceleration for an astronaut and it has to do with the vector nature of velocity. ![]() Of course it would be quite difficult to continue to accelerate by speeding up for a significant time (but not impossible). If this acceleration is in the direction from the feet to head of the astronaut, there will also be a force from the floor pushing up and the astronaut will feel an apparent weight. If you change the velocity of the spacecraft, you will have an acceleration. Over this time interval, the average acceleration would be: But for now, let's say that I look at some short time interval. Both force and acceleration are vectors - this will be important in a little bit. This says that the total (net) force on an object makes it accelerate. Perhaps you are familiar with this equation: ![]() So how do you make this force on the astronaut in space? It all depends on the nature of force. ![]()
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