Question

Describe an activity to show that friction depends on the force pressing the two surfaces together

Answer 1

Explanation:

Take an object and tie it with a spring balance. Now take two(smooth and rough) surfaces. Drag the object while it is still attached to the spring balance on the smooth surface. Observe the reading of the spring balance.

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Answer 2

Here is your activity

Step 1

Collect three of your school textbooks that are different size and weight (you can use books of various sizes that you have at home as well).

Step 2

Record the weight of each of the books before experimenting.

Step 3

Find three different surfaces to slide (or push) the textbooks on (examples: table, carpet, tile floor, etc.).

Step 4

Being sure not to damage the textbook, slide the textbook along various surfaces, keeping a keen eye on the frictional force that each surface has on the movement of the textbooks.

Step 5

Record the time and distance that each book traveled on the three different surfaces on your provided 49ers Frictional Force worksheet.

Stop & think

What factors do you think affect the size of the frictional force? Explore combinations such as a sliding on different sides of the textbook, on different surfaces areas, or stacking books on top of each other, or combinations thereof. Come up with some predictions on how fast and far you think the textbooks will travel.

Step 6

Tie strands of string around each textbook, and this time, pull each book and record the time it takes to pull the same distance you pushed the book on the three surfaces. Write down your observations and record the times of this experiment.

Step 7

Answer the following question: What effect would friction have on a rolling football?

Hint: Footballs are different from the books you pushed and pulled in that they have a shape that when rolled, reduces friction. You may think that footballs are immune from friction, but the surface on which they roll have a lot to do with how much friction is applied to the football. And of course, gravity has the ability to slow the football down as well.

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