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6. Which of these is not a contact force
- static electricity
- upthrust
- air resistance
- water resistance
7. What friction is caused when something moves through water
- water float
- speed
- water resistance
- air resistance
8. What force attracts objects made of iron
- static electricity
- contact force
- magnetism
- air resistance
9. Which of these isn't a force acting on a submarine
- up thrust
- forward pushing force
- friction
- gravity
10. Which of these forces can not effect an object
- speed
- umbrella
- shape
- direction
11. What causes something to move through the air
- gravity
- air resistance
- contact force
- friction
12. What happens when two things rub together
- friction
- air resistance
- force
- shape