A presentation on Friction

1. Welcome To Our Presentation

2. Mokhlesur Rahman
18-158

3. SN. NAME ROLL REMARK
1 Enamul Huque 18-054
2 Raihanul Islam 18-056
3 Md. Sazzad Hossain 18-068
4 Emon Hasan Rahat 18-134
5 Mokhlesur Rahman 18-158
6 Mst. Nasrin Sultana 18-206
Group NO: 12

4. Friction

5. Our Presentation on:Our Presentation on:
• Friction Basics
• Measuring Friction
• Friction and Gases
• Friction and Liquids
• Friction: Static vs. Kinetic

6. Md. Sazzad Hossain
18-068

7. Friction BasicsFriction Basics
• Friction is the "evil"
of all motion. Friction
is a Force that holds
back the movement of
a sliding object.
• Move something left,
friction pulls right.
Move something up,
friction pulls down.

8. Friction BasicsFriction Basics
• It appears as if nature has given us
friction to stop us from moving
anything.

9. Emon Hasan Rahat
18-134

10. Measuring FrictionMeasuring Friction
• Measures of friction are based on the
type of materials that are in contact.
Concrete on concrete has a very high
coefficient of friction.
• That coefficient is a measure of how
easily one object moves in relationship
to another.

11. Measuring FrictionMeasuring Friction
Scientists have
discovered that there is
even less friction in your
joints than in Teflon! It
is one more example at
how efficient living
organisms can be.

12. Raihanul Islam
18-056

13. Friction and GasesFriction and Gases
• Friction only happens with solid objects,
but you do get resistance to motion in
both liquids and gases. This doesn't
involve sliding surfaces like friction does,
but is instead the kind of resistance you
get if you try to push your way through a
crowd.

14. Friction and GasesFriction and Gases
• It's a colliding situation, not a sliding one.
If the gas is air, this is referred to as air
resistance.

15. Mst. Nasrin Sultana
18-206

16. Friction and Liquids
• Although liquids offer resistance to
objects moving through them, they also
smooth surfaces and reduce friction.
Liquids tend to get thinner (less viscous)
as they are heated.

17. Friction and Liquids
• Car engines have a lot of moving parts,
and they rub on each other. The rubbing
produces friction and the result is heat.
When oil is added to a car engine, the oil
sticks to surfaces, and helps to decrease
the amount of friction and wear on the
parts of the engine.

18. Enamul Huque
18-054

19. Friction: Static vs. KineticFriction: Static vs. Kinetic
Static :
If you try to slide two
objects past each other, a
small amount of force
will result in no motion.
The force of friction is
greater than the applied
force. This is static
friction.

20. Kinetic :
If you apply a little more force, the
object "breaks free" and slides, although
you still need to apply force to keep the
object sliding. This is kinetic friction.

21. Thank youThank you