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6. According to the principle of moments, for an object in equilibrium... the sum of all clockwise moments about any point..

  • is greater than the sum of the anticlockwise moments about that poin
  • is equal to the sum of the anticlockwise moments about that point
  • is less than the sum of the anticlockwise moments about that point

7. Something will topple if the line of action its weight falls outside the base?

  • True
  • False

8. Stability is increased by..?

  • Widening the base
  • Making the base smaller

9. For an object moving in a circle at constant speed the objects velocity is

  • directed towards the centre of the circle
  • directed along a tangent to the circle
  • directed away from the circle

10. The object accelerates...

  • along a tangent to the circle
  • towards the centre of the circle
  • away from the circle

11. This is called the centripetal force?

  • True
  • False

12. What makes this force bigger?

  • increase the mass and speed of the object
  • decrease the mass and speed of the object
  • increase just the mass

13. What else increases this force?

  • decrease the radius of the circle
  • increase the radius of the circle

14. What makes the force of gravity larger?

  • increase the mass and decrease the distance
  • decrease the mass and increase the distance
  • decrease the mass and decrease the distance
  • increase the mass and increase the distance

15. What shape is a planets orbit?

  • Semi-circular
  • Eliptical
  • Circular

16. Which type of satellite is for weather, survelance and environment?

  • Monitoring
  • Communications

17. How long is the period of a monitoring satellite?

  • 2-3 hrs
  • 24 hrs
  • 12 hrs

18. Communications satellites orbit around the poles?

  • False
  • True

19. Communications satellites orbit around the equator?

  • True
  • False

20. What type of orbit does a communications satellite have?

  • geostationary
  • geothermal
  • geomoving