FRICTION 2

HYPOTHESIS

How will different surfaces affect the amount of friction?

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MATERIALS

1 science book1 bucketbrown paper
1 loop of string1 hookwax paper
15 weights2 pieces of masking tape

PROCEDURE

1. Clear off your desks. Get all of your materials.

2. Tape brown paper to one desk and wax paper to another. Leave part of one desk clear.

3. Put the loop of string around one science book.

4. Place the book about 1 inch from the edge of the desk with no paper on it. Hang the string over the edge of the desk and attach the bucket to the string with the hook.

5. Add weights to the bucket one at a time until the book moves or starts to slide. Be sure and add the weights gently. Record the number of weights needed.

SURFACEPREDICTIONWEIGHTS NEEDED
Plain Desk
Brown Paper
Wax Paper

6. Predict how many weights you will need if the book is on the brown paper or the wax paper.

7. Repeat the experiment with the book on the brown paper and the wax paper. Record your results.

CONCLUSION

How do the different types of paper affect the amount of friction acting on the book and therefore the amount of weight needed to move the book?

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