What factors determine the strength of the friction force between two surfaces?
-
Upload
lesley-park -
Category
Documents
-
view
226 -
download
0
Transcript of What factors determine the strength of the friction force between two surfaces?
![Page 1: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/1.jpg)
10-2: Friction, Gravity, & Elastic Forces
What factors determine the strength of the friction force between two surfaces?
![Page 2: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/2.jpg)
Anticipatory Set
Why can he move an elephant with only his finger?
![Page 3: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/3.jpg)
California StandardsScience Standard 8.2.b: Students know when
an object is subject to two or more forces at once, the result is the cumulative effect of all the forces.
Science Standard 8.2.d: Students know how to identify separately the two or more forces that are acting on a single static object, including gravity, elastic forces due to tension or compression in matter and friction.
![Page 4: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/4.jpg)
Inputfriction: a force that two surfaces exert on
each other when they rub against each other.static friction: the friction that acts on
objects that are not moving.sliding friction: two solid surfaces slide over
each other.rolling friction: an object rolls across a
surface.
![Page 5: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/5.jpg)
Inputfluid friction: a solid object moves through a
fluid.gravity: a force that pulls objects toward
each other.mass: the measure of the amount of matter
in an objectweight: the gravitational force exerted on a
person or object at the surface of a planet.
![Page 6: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/6.jpg)
Inputfree fall: the only force acting on an object is
gravity.air resistance: an upward force exerted on
falling objects.projectile: an object that is thrown.compression: an elastic force that squeezes
or pushes matter together.tension: an elastic force that stretches or
pulls matter.
![Page 7: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/7.jpg)
Input & ModelingFriction
The strength of the force of friction depends on the types of surfaces involved and on how hard the surfaces push together.There are four types of friction…
![Page 8: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/8.jpg)
Input & ModelingStatic Friction
![Page 9: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/9.jpg)
Input & ModelingSliding Friction
Once the box is moving,
there is sliding friction
between the box and the
floor.
![Page 10: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/10.jpg)
Input & ModelingRolling Friction
![Page 11: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/11.jpg)
Input & ModelingFluid Friction
![Page 12: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/12.jpg)
Input & ModelingGravity
The force of gravity between objects increases with greater mass and decreases with greater distance.
Weight = Mass x Acceleration due to gravity
![Page 13: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/13.jpg)
Input & ModelingGravity
Gravity Between Objects
![Page 14: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/14.jpg)
Input & ModelingGravity and Motion
In free fall, the force of gravity alone causes an object to accelerate in the downward direction.
free fallair resistanceprojectile motion
![Page 15: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/15.jpg)
Input & Modeling
Free Fall
Projectile Motion
Air Resistance
![Page 16: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/16.jpg)
Input & ModelingElastic Forces
Matter is considered elastic if it returns to its original shape after it is squeezed or stretched.
CompressionTension
![Page 17: What factors determine the strength of the friction force between two surfaces?](https://reader033.fdocuments.in/reader033/viewer/2022051114/56649e0d5503460f94af6bf8/html5/thumbnails/17.jpg)
HOMEWORK CONNECTION Read pages 380-388 in your Science textbook.
Complete the Section 10-2 Review & Reinforce
Write a detailed SUMMARY of the section and complete the UNANSWERED QUESTIONS section of your notes.
Choose two of the remaining Depth & Complexity ICONS in your notes and explain how they relate to this section.