Revise GCSE Physics


P3g Falling Safely

  1. What are reaction forces?
  2. Name three frictional forces?
  3. What effect does friction have on the energy and efficiency of a system?
  4. Can anything be done about frictional forces?
  5. What is terminal velocity?
  6. At terminal speed, how are the drag and weight forces related?
  7. Explain how an object falling through the Earth's atmosphere reaches a terminal speed.
  8. When is there no drag force?
  9. Why do falling objects not experience drag when there is no atmosphere?
  10. What two factors affect the size of a drag force?
  11. Which falls faster, a big object or a small object?
  12. What acceleration do all objects have near the surface of the Earth?
  13. What is the difference between gravitational field strength, g and the acceleration due to gravity (usually called the acceleration of free fall)?
  14. Is the acceleration due to gravity constant?
  15. Is the acceleration due to gravity affected by atmospheric changes?
  16. What is the resultant force?
  17. What can we say about the size and direction of a resultant force in each of these circumstances? 1. The speed of an object increases. 2. The speed of an object decreases. 3. The speed of an object remains constant.