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# Friction

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### Friction

1. 1. Your teacher has given you the following assignment: Investigate the impact on plant growth of adding various amounts of fertilizer to potted plants. Think about what you would need to do to be certain that the fertilizer was having an impact on plant growth. Then answer the items below. Write “yes” for each of the items below that would be part of your plan to investigate plant height and fertilizer. Write “no” for each of the items below that would not help you investigate plant height and fertilizer. 1. Put one plant in a sunny windowsill and one in a dark corner. 2. Give plants the same amount of water. 3. Give different plants different amounts of fertilizer without keeping track of which plant got extra fertilizer. 4. Use some new plant seeds and some old plants that have been growing for months. 5. Start with plants that are the same size. 6. Keep all plants in a similar location. 7. Carefully note amounts of fertilizer each plant is given. 8. Keep one plant fertilized but with no water. No Yes No No Yes Yes Yes No
2. 2. ReviewReview Scientific Method Variables –Independent –Dependent Constants Control
3. 3. ForceForce Force is a push or a pull Can push or pull in any or all directions
4. 4. ForceForce Metric unit – newton (N) 1 N = .22 lbs
5. 5. ForceForce The effect of a force depends on two things: Magnitude (strength) and direction Vector quantity
6. 6. FrictionFriction A force that acts to prevent slipping between two surfaces Is always present when two surfaces touch
7. 7. FrictionFriction Static friction- the frictional force needed to be overcome to get an object moving
8. 8. FrictionFriction  Kinetic friction- the friction of an object in motion  Kinetic friction is always less than static friction