FizziQ//A robot on Mars//The Opportunity robot, which travels the planet Mars, needs to be able to follow a rectilinear trajectory autonomously and without GPS//A rectilinear movement is the movement of a point body moving in a straight line right in a given frame of reference//Which FizziQ Instrument could you use to have your phone follow a straight path on the Earth?//Outside your home, use this measuring instrument and record a rectilinear movement of your mobile on a distance of about 150 paces//Analyze the graph, has your cell phone made a rectilinear movement in the terrestrial frame of reference?//The planet Mars does not have a magnetic field, you can't use a compass. What other sensor in could you use to help you move in a straight line?//Try this new idea. What problems are you having?//If this second solution fails, do you have an idea for a third instrument that could be used?//Try this solution and record your movements. Is this a good troubleshooting solution?//Document all these experiments in your notebook with your findings on controlling robots on the planet Mars