Question

E.g. "What is space time fabric? Is it even a real thing or just an hypothetical concept to explain gravity?" Answer: Spacetime is real. The fabric part is a metaphor to help us understand the geometry better because you can't visualize spacetime. The way we perceive time isn't tied to spatial dimensions like length, width and height. But it is tied to those dimensions and we need a tool to use to visualize it. Typically we picture it as a stretchy sheet of fabric and the heavier something is the more it pulls the fabric down when you set it on top. Then if you start something rolling on the fabric it won't move in a straight line because it'll follow the curvature of the sheet of fabric. That's the basic idea behind gravity, although there's a lot more to it. 1. What is meant by the following phrase? "Velocity is the rate of change of displacement" 2. How can you measure how fast something is moving? (In a high school lab setting) 3. What's the difference between precision and accuracy? 4. What does it mean when a scientist says that a ruler has an error of 0.05 cm"? 5. How are mass and weight different? 6. How does an object orbit another object? Why doesn't the Earth just fall into the Sun? In a clear coherent paragraph length response answer the following question. (not ELIF, write with the same quality you would on the AP exam) 7. What would it mean if something could have negative mass? How would it move and how would it respond to forces? What about gravity (between it and other things with negative mass and between it and objects with positive mass)? Compare this to real world objects with positive mass.

Answer 1