All About FRICTION

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14 Νοε 2013 (πριν από 3 χρόνια και 6 μήνες)

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Year 7 Forces





Name: ______________________________

Form: _______

All About FRICTION

1.

What is Friction? [ 3 points ]





2.

Write down at least 20 Daily Uses of Friction


No

Friction


No

Friction

1



11


2



12


3



13


4



14


5



15


6



16


7



17


8



18


9



19


10



20



3.

Give 3 situations where friction beco
mes an advantage or a nuisance.





4.

Describe 5 ways in which friction can be decreased or reduced.








No

Friction


No

Friction

1

Tie up shoe lace


11

Pulley wheels

2

Eraser

-

erasing an answer using a
rubber


12

Grind stone to sharpen chisels and
knives

3

Drying wet towel


13

Rubber balloons with your hair to
create statics

4

Sand paper


14

Pen cap

5

Nail File


15

Cork in bottle

6

File


16

Brake pad in car or bike

7

Plier


17

Tyres

8

Nail to the wood


18

Rub your hands together and feel
the warmth

9

Open screw top


19

Washing your hand properly

10

Turning door knob


20

Velcro in bags or shoes






21

Holding chopsticks


31

Scrubbing a plate

22

Striking a
match


32

Brushing your teeth

23

Walking

-

if there is no friction
between your shoes/feet and the
floor, you would be slippering in one
place forever.


33

Friction between paper (2 books)

24

Running


34

Microfiber sponge for cleaning

25

Holding a pen


35

Moving object eventually stops

26

Chewing food


36

Meteors hitting the earths
atmosphere
-

the friction is what
causes the heat that makes them
burn up

27

Maintaining balance


37

Roll a penny and watch it stop.
Friction of the air and the rolling
res
istance is what slows it down

28

Keeps your pants on


38

It keeps us on our feet, have you
ever tried standing on a completely
frictionless surface?

29

Car moving forward


39

Spinning and Smashing in Table
Tennis or Tennis

30

Friction belt in car or
cooler


40

An object sitting on an included
plane




Definition of

friction

1.

Friction is the resistance that one surface or object encounters when moving over
another or a force that slows motion and dampens energy.

2.

Friction

is the force that resists relative motion between two bodies in contact.

3.

Friction

is a force which causes the motion between two surfaces to be reduced.

4.

Friction is a force that is created whenever two surfaces move or try to move across each
other.



5.

Friction

is a force that acts in an opposite direction to movement.


Facts about friction

1.

Friction always opposes the motion or attempted motion of one surface across another
surface.

2.

Friction is dependant on the texture of both surfaces.

3.

Friction is also
dependant on the amount of contact force pushing the two surfaces together
(
normal force
).



4.

Friction

keeps us from slipping and falling everywhere.

5.


Ways to
increase friction

1.

Make the surface rougher

2.

Use rough surface materials


eg. Carpet, cork

3.

Increase the surface area



opening the parachute


Ways to decrease friction

1.

Smoothen the surface eg. Using very fine sand paper

2.

Aerodynamic or streamline structures

3.

Using lubricant, eg. Wax, oil, water, WD40 etc

4.

Fluid between joints in animals

5.

Swallowing


with water/ liquid or more saliva



Disadvantages of Friction

1.

Wearing out tyres and brake pads

2.

Wearing out shoes

3.

Heat produced by Engine


rubbing parts

4.

Forest fire
s can be caused due to friction when the branches of trees rub against each
other.

5.

Drag and water resistance slow down the moving object

6.

Air resistance (drag) slow you from riding a bike or running

7.

Opposing the motion

8.

Producing noise


door hinge with to
o much friction.

9.

Vehicle tyres on a roadway, a process which generates heat and sound


Types

of Friction

1.

Static

friction: friction between two objects that are not moving relative to each other

2.

Rolling Friction
-

associated with the rolling of a wheel or
something circular along a
surface.

3.

Kinetic or Sliding friction is friction where an object slides, or rubs against, another
surface.

4.

Fluid friction is the friction of something going through any type of liquid or air.