Let's consider an astronaut with a mass of 76.0 kg standing on the Earth. What is the gravitational force (in N) on the astronaut? (Review your work from the previous part. Remember that you can use the full gravitational force formula, or  w = mg.) weight on the Earth's surface = 744.8 N   Now let's imagine that same astronaut in orbit aboard the space station, orbiting at an altitude (height above the Earth's surface) of 380 km. We first need to find the astronaut's distance to the center of the Earth. What is the altitude expressed in units of meters? 380 km = 380000   The radius of the Earth is 6.37 ✕ 106 m. What is the total distance (in m) from the center of the Earth to the astronaut? r =_________m   Finally, let's put it all together. Use the universal gravitational force formula to find the force (in N) on the astronaut, where  m = 76.0 kg,  the Earth's mass  ME = 5.97 ✕ 1024 kg,  and the distance r is the result you just found. F =  ______N   solve for the two bolded sections

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Central Force

Central force is the force that acts along the center of mass of one body to the center of mass of another body. Its direction from or away from a point on a body to another is called the center of the force. Such forces include gravitational force between two massive objects or electrostatic forces between two charged particles. So from atoms to planets, the central forces play an important role in shaping our daily lives. One of the remarkable features of central forces is that they are conservative, i.e. the total energy of a central force system can always be expressed as a gradient of a potential energy function.