A 600 kg satellite is in a stable circular orbit around Earth at an altitude of 2000 km. An astronaut inside the satellite is conducting an experiment with a 2.0 kg mass. Which of the following statements best describes the forces acting on the 2.0 kg mass relative to the astronaut?
The gravitational force on the mass is significant, and the normal force from the astronaut’s hand is equal and opposite to the gravitational force, resulting in a net force of zero.
The gravitational force on the mass is nearly the same as on Earth, and the normal force from the astronaut’s hand is zero, so the mass accelerates towards the floor of the satellite.
The gravitational force on the mass is slightly less than on Earth, but the normal force from the astronaut’s hand is negligible because both the mass and the astronaut are in free fall.
The gravitational force on the mass is zero, and the normal force from the astronaut’s hand is zero because the satellite is in a zero-gravity environment.
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Create Free Account Log inThis is a free VCE Units 3 & 4 Physics practice question worth 1 mark, testing your understanding of Forces on satellites. It falls under How do things move without contact? in Unit 3: How do fields explain motion and electricity?. Submit your answer above to receive instant AI-powered marking and personalised feedback.
In this unit students use Newton’s laws to investigate motion in one and two dimensions. They explore the concept of the field as a model used by physicists to explain observations of motion of objects not in apparent contact. Students compare and contrast three fundamental fields – gravitational, magnetic and electric – and how they relate to one another. They consider the importance of the field to the motion of particles within the field. Students examine the production of electricity and its delivery to homes. They explore fields in relation to the transmission of electricity over large distances and in the design and operation of particle accelerators. A student-designed practical investigation involving the generation of primary data and including one continuous, independent variable related to fields, motion or light is undertaken either in Unit 3 or Unit 4, or across both Units 3 and 4, and is assessed in Unit 4, Outcome 2. The design, analysis and findings of the investigation are presented in a scientific poster format.
In this area of study, students examine the similarities and differences between three fields: gravitational, electric and magnetic. Students explore how positions in fields determine the potential energy of, and the force on, an object. They investigate how concepts related to field models can be applied to construct motors, maintain satellite orbits and to accelerate particles including in a synchrotron.
Apply the concepts of force due to gravity and normal force including in relation to satellites in orbit where the orbits are assumed to be uniform and circular.
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