Science - Friction
作者：Angela Dobson
1. Measure
1.1. Force Meter
1.2. Newtons
2. Friction good
2.1. grip
2.2. car tyres
2.3. shoes
2.4. handles
3. Little friction
3.1. ice skates
3.2. fireman pole
4. water resistance
4.1. pointy shape
4.2. to reduce friction
5. springs
5.1. push
5.2. pull
6. Magnets
6.1. 2 poles
6.1.1. north
6.1.2. south
6.2. attract
6.2.1. N - S
6.3. repel
6.3.1. N -N
6.3.2. S -S