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6. An iron core is used in transformes so it can become magnitised
7. Why is insulated wire used to make the coils?
- So it is safer
- To make sure everything stays connected
- To prevent a short circuit
- So it doesnt harm people
8. More powerful magnets increase the potential difference
9. What does Centre of Mass mean?
- The centre of mass is the point where the object will fall
- The centre of mass is the point at which the total mass appears to be concentrated
- The centre of mass is the point where the object will be stable
10. What is meant by the period of a plant?
- The time taken between each rainfall
- The time for a planet to go around the sun
- The time taken to make one orbit
- The time taken for the moon to go around the earth
11. Acceleration changes the speed but not the direction
12. Explain how helium was formed (lighter element)
- The fusion of heavier elements
- The fusion of dust particles when they come together to form stars
- The fusion of hydrogen atoms
- In a supernova