Science.com explains that microgravity affects the body in many different ways, primarily through bone and muscle loss. The lack of pressure on bones causes the body to reabsorb calcium from them, weakening them and potentially causing kidney stones. A similar lack of load on muscles can lead them to become atrophied over time. The body's fluids also shift, leading to inner-ear problems as well as a feeling of congestion.Know More
Minor effects of microgravity include pressure changes inside the eye that can slightly alter an astronaut's vision, gastrointestinal distress due to changes in the digestive tract, and a slight lengthening of the spine. In addition to the direct physical changes microgravity causes in the body, other aspects of spaceflight can also have detrimental effects. For instance, astronauts deprived of the traditional day-night cycle can suffer sleep disruptions, exacerbated by the tight quarters and constant activity in spacecraft, according to the National Science Biomedical Research Institute.
In order to combat these problems, astronauts on extended space missions must make time every day for rigorous exercise programs, and must consume nutritionist planned meals in order to provide all the nutrients the astronauts need to stave off bone loss and other potentially dangerous conditions. Ultimately, astronauts must be rotated back to Earth on a regular basis to prevent long-term health issues.Learn more about Motion & Mechanics
The upper limit for the punching force of a human hand is theoretically set at 50 kilonewtons. This amount of force is equal to the impact of 5,000 kilograms or 2,000 5-lb. bags of potatoes simultaneously dropping to the ground. A punching force that exceeds 50 kilonewtons will break the bones of the arm.Full Answer >
Vitamin B3 affects the human body in a number of ways, including lowering bad cholesterol, supporting the nervous system and assisting the body in converting food into energy. Vitamin B3 is also essential for healthy hair, skin and nails, explains Encyclopedia.com.Full Answer >
Weight affects friction in that friction is directly proportional to the weight of the load one is moving. If one doubles the load being moved, friction increases by a factor of two.Full Answer >
Since friction opposes movement, it causes resistance that makes it harder for a sliding object to move, thus slowing down movement. Friction can be seen through the example of a car making a stop; the wheels and breaks cause friction, making the car slow down. In addition to affecting solid objects, friction also causes resistance with glass and liquids by causing a collision that results in heat.Full Answer >