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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?
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?
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?
18. Communications satellites orbit around the poles?
19. Communications satellites orbit around the equator?
20. What type of orbit does a communications satellite have?
- geostationary
- geothermal
- geomoving