Friction lab powerpoint

1. Good Afternoon!
Today we will:
do a three part lab
Please Do BEFORE THE TARDY BELL:
get your lab notebook
get out something to write with
get out your spiral

2. Warm-Up
In your spiral, answer the following two
questions in complete sentences by
restating the question:
According to Newton’s 3rd Law, what are the
two forces acting on a shoe that is resting on
a table?
According to Newton’s 1st & 2nd law, what
must be present for an object to accelerate?

3. Warm-Up, Part II
In your spiral, write a hypothesis
statement for the following question:
What is the effect of a lack of sleep on a
child’s school performance?

4. What Do You See?

5. The Mu of the Shoe
In your lab notebook, open to the first
clean page and title it, “The Mu of the
Shoe – Frictional Forces.”
Don’t forget to make an entry in your
Table of Contents as well – Chapter 2,
sec 7

6. The Mu of the Shoe
Today, we are going to investigate the
factors involved in friction.
The factors (variables) we will be looking
at today are:
weight WRITE
properties of the surfaces THIS
DOWN
surface area

7. Variables
We will be testing three variables.
What are they?
weight
type of surface
surface area
Because we are testing three different
variables, we will do three separate
experiments

8. Form a hypothesis statement
Investigation #1
What is the effect of weight on the frictional
force between two objects?
1. copy down this question in your lab
notebook
2. write a hypothesis statement that can be
tested in order to answer the question

9. Procedure – In your Lab Group
Thinking about the materials we will use
and how you will test your hypothesis,
write out a procedure and create a data
table. Plan to have at least five different
weights. Finish Investigation #1 in:
You have seven minutes.

10. Time to test the Effect of Weight!
Get back in your lab groups and conduct
your investigation on the effect of weight
on frictional force.
You have 10 minutes to complete.

11. Form a hypothesis statement
Investigation #2
What is the effect of a rough surface on the
frictional force between two objects?
Copy down this question and write a hypothesis.
In your group, create a new procedure and
data table for this investigation and run the
experiment. You have 8 minutes.

12. Form a hypothesis statement
Investigation #3
What is the effect of surface area on the
frictional force between two objects?
Copy down this question and write a hypothesis.
In your group, create a new procedure and
data table for this investigation and run the
experiment. You have 10 minutes.