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7th Grade Science

Ms. B

on 9 February 2017

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Transcript of Friction

Go to Google Classroom
Open assignment(s) in DocHub
Fill in and submit
Export DocHub doc to Google Drive
Go back to classroom assignment in "Your Work" view, click on ADD + then the Google drive icon
Add your doc + TURN IN
Update your agenda + TOC!
Answer the following in complete sentence(s) on your bellwork page w/ today's date:
Which type of force, balanced or unbalanced, has net force = 0?
Which type of force, balanced or unbalanced, creates movement?
What is Friction?
friction - force that slows down or prevents motion
- acts in the direction opposite motion
What determines the strength of the force of friction?
How do brakes use friction to work?
Why do different road conditions make it harder to stop?
What are the 4 types of friction?
Friction: 7.P.1.2
Which type of friction requires the greatest force to overcome?
Learn friction vocab
Apply current understanding of forces
Prepare for Notes
Strength of the force of friction depends on two factors:
- how hard surfaces push together and the types of surfaces involved
1. Static Friction
- acts on objects not moving
2. Sliding Friction
- when solid objects slide over each other
- ex. book sliding over a table
3. Rolling Friction
- when an object rolls across a surface
- ex. car wheel on a highway or bowling ball rolling down a lane
4. Fluid Friction
- when things move across or through a fluid (liquid or gas)
- ex. lubricants in car engine, water skiing, or an airplane flying
Friction + Olympic Sport
pop top
Bill Nye
Friction + Gravity

Update your agenda
Take out a sheet of paper
Name, date, + block
6 Facts EACH (12 total)
Update your agenda!

Take out your homework and be ready to go over it.

Think about this: What force is being overcome by a hovercraft?
Recall discussion of friction + gravity
Demonstrate opposing forces + understanding of data collection + analysis
[students will be able to...]
Science Concept:
Special Instructions:

Goggles required due to forces involved
Be aware of possible burn risk w/ glue gun
Floating on Air:
The hover craft will glide across the table until it runs out of air.
Old CD
Pop top
Hot glue gun
3 types of friction are: sliding, rolling + fluid.
Sliding friction
occurs between two solid objects in direct contact with each other.
Rolling friction
occurs when one surface rolls over another surface.
Fluid friction
occurs when two surfaces are separated by a fluid (a liquid or gas) such as air.
What to Do
1. Close the pop-top lid and glue the base so the lid covers the hole
in the center of the CD.
2. Blow up a balloon and pinch the neck so that no air can escape.
3. Stretch the neck of the balloon over the pop-top.
4. Place the CD hovercraft on a table top and push it. How far does it move? Record your data in the table provided below.
5. Repeat step 4 with the same amount of force. Record your data.
6. Open the pop-top lid and use the same amount of force as before to push the hovercraft. How far does it move this time? Record your data.
7. Carefully remove deflated balloon, re-inflate to the same previous volume, and repeat step. Record your data.
Recorder Copies This
Group Roles
Controller: in charge of assembling, inflating, and maneuvering the hovercraft
Recorder: In charge of measurements + recording data
Friction Type
Sliding Friction
(closed top)
Fluid Friction
(open top)
Trial 1 Distance
Trial 2 Distance
Average Distance
1. Which procedure allowed the hovercraft to go the furthest, closed top or open top?

2. Which type of friction does the closed top hovercraft use?

3. What type of friction does the open top hovercraft use?

4. Which type of friction is more effective at opposing the motion of the hovercraft?

5. From your conclusion, infer why the moving parts in a car’s engine are lubricated with oil. Predict what would then occur if the oil were drained while the engine was still running.
Data Analysis/Conclusions:
I'm done, now what?
Read pages 656 to 659 and complete
Section 5 Assessment
(pg. 659). You may work with your partner but must have your own paper to turn in.
Friction Vocab
sliding friction
fluid friction
static friction
rolling friction
Force Comic
Draw and color your own example of the force comic above. Include ALL vocabulary word labels where appropriate.
balanced force, unbalanced force, gravity, air resistance, static friction, sliding friction, rolling friction, fluid friction
*Provide an example for each + a drawing!
What forces do you see?
Set up your next notebook page with the following data tables + include headings. Then, begin reading p. 28.
Investigate friction w/ different surfaces, weights, + surface areas
#1 Average Force of Friction on Different Surfaces
#2 Average Force of Friction Versus Weight (Load) on Tabletop
#3 Changing the Surface Area
Leave space in between each table to answer questions!!!
As you work, you need to record the following:
4.1: p. 32, # 6, 8 (graph), + 9 A through D
4.3: p. 34, #3, 5 + 6
When you finish ALL lab work begin reflection questions on p. 35!
Have out HW + progress report to be checked + take out your lab from yesterday. If you did not finish graphing or questions, work quietly on completing.
Continue exploring forces of friction.
Lab Discussion
Fill in any missing info as needed.
Reading Selections
Flashback Friday
Complete a 1 paragraph summary + the discussion questions for BOTH friction reading selections; p. 36 + 40
Include selection title for each!
Full transcript