Do Now1. Look at this picture, what
kind of action is she using?
2. The woman is
exerting a force.
What does exertion mean?
3. Are you exerting a force when you:
a. use a pencil to write with?
b. stand up?
Do Now1. Look at this picture, what kind of action is
she using?
She is using a force. A force is a push or
a pull.
2. The woman is exerting a force. What does
exertion mean?
Exertion means to make an effort on
something you do.
3. Are you exerting a force when you:
a. use a pencil to write with? yes
b. stand up? yes
Video Do Now. Write the questions and watch
the short video clip for your answer.
1. How is the bunny exerting force as he chases
the cat?
2. How much force is the cat exerting as she
tries to fit in the box?
1. How is the bunny exerting force as he chases
the cat? He pushes his feet off the ground.
2. How much force is the cat exerting?
The force she is exerting to pull and
push on the box is equal to her weight.
Do Now
1. In a free body diagram, a square represents a
person or an object
___
that is exerting the force .
2. Up to a maximum of four forces which are
represented by arrows
___
, can exert force on the
same object.
3. Each square must be labeled and also each
arrow must be labeled a specific direction and
force .
___
gravity and forces
http://www.neok12.com/php/watch.php?v=zX5e6c5
8056e686d02660767&t=Types-of-Forces
Magnetic force
http://www.neok12.com/php/watch.php?v=zX5
e757c41706a4c05184177&t=Types-of-Forces
Notes- Forces
push or a pull on a
1. A force is a ____
object
person or an ___
2. There are ___
two types of forces:
contact forces and ________
long range forces.
___
1.
Applied
Force
A person or an A man tugs
action which
down on his
directly
tie.
pushes
_______ or
pulls on a
system.
Example:
2.
Normal
Force
It is the
The teacher is
support force standing.
_______
that is in
contact with
another
stable
_______
object.
Example:
3. Frictional
Force
-two
properties:
-it must
create heat
-it must slow
the object
down
It is force
A player
exerted or
slides to
used by a
____
home plate.
surface as an
______
object moves
across it.
Example:
Do Now- Look at the forces on the front page of
yesterday’s handout, “Contact and Long Range
Forces”.
1. Identify the force. You slide your journal from
side to side.
2. Draw a free body diagram. A golfer swings his
club and hits the ball on the left field.
4.
Air
Resistance
Force
it is the force
_____ A bird flaps
observed to his wings to
oppose the
fly up.
motion
_______ of an
object that
travels
through the
air
___.
Example:
5.
Tensile
Force aka
Tension
The force
from a
__________
cable, string,
etc, when it is
pulled tight
by forces
acting from
opposite
________
ends.
Example:
The phone
pole on the
left is
attached to a
cable that is
anchored to
the ground.
6.
Spring
Force
The force that
comes from a
___________
compressed
or stretched
spring where
the object is
attached
___________
to.
Example:
A slingshot is
used to shoot
the lighted
ceiling.
7.
Buoyant
Force
The _________
upward
Cheerios in
Force on an
milk
object
produced by
the
surrounding
fluid
___________.
Examples:
Types of Long
Range Forces
8.
Electrical
Force
The force of an
attractive
____________
or repulsive
interaction
betw any two
charged
___________
Particles.
X
9.
Magnetic
Force
magnetic
A ___________
field exerts a
force on a
single moving
___________.
charge
X
10.
Gravitational
Force
It is the
force
____________
that the Earth
has to pull
down to its
center.
Example:
The bouncing
ball drops
down to the
floor.
Forces- Free Body Diagram
8. Tension force
9. applied, friction
10. normal, friction, and applied
11. one force
Do Now
Draw a free body diagram:
1. An egg is dropped from its nest.
2. A grocery bag rests on a table.
(slide 6)
3. A hockey puck is gliding to the
left and slowing down. (slide 17)
4. A horse pulls a sleigh to the
right. (slide 10)
#1 An egg is dropped from its nest.
F air
egg
Fgrav
#2 A grocery bag rests on a table. (slide 6)
F norm
bag
F grav
#3 A hockey puck is gliding to the left and
slowing down. (slide 17)
F norm
Hockey
puck
F frict
F grav
#4 A horse pulls a sleigh to the right. (slide 10)
F norm
sleigh
F frict
F grav
F app
http://www.wisconline.com/Objects/ViewObject.aspx?ID=TP150
2
here is the link for animated slides.
Do Now
Draw a free body diagram by watching the
video:
1. a dog is walked by her owner on my right
side
2. a skier goes downhill to my left
3. people paddling west on a river
1. a dog is walked by her owner on my right side
F norm
F frict
dog
F grav
F app
or
Ftens
2. A skier goes downhill to my left
2. Skiing downhill
F norm
skier
F app
F grav
F frict
or
F air
3. People paddling west on a river
3. People paddling west on a river
F buoy
raft
F air
F app
F grav
Do Now
Write a free body diagram for the magazine
clippings.
1. Two girls riding to the left.
2. A man surfing to the east.
1. Two girls riding to the left.
F norm
bike
F app
F grav
F air
or
F frict
2. A man surfing to the east.
If he was kite flying…
F tens
F buoy
surfer
F air or
F frict
F grav
F app
Do Now1. Draw a Free Body Diagram of this magazine
clipping. Explain which forces you choose.
bicyclists
Choose two pictures from a magazine.
No computer printouts or drawings. Cut each picture
into a square. Identify your square. Find out which
three forces act on the picture. Then draw three
arrows and label each force. Your cut and paste project
should now look like a free body diagram.
Repeat the same instructions for your second picture.
Make sure none of the forces are repeated for both
pictures.
On back of the paper, write the forces that are exerted.
CREATE A FREE BODY DIAGRAM
1. Cut out two pictures
from magazines
2. Label each picture
and the three forces that
exerts on it.
3. None of the forces
should be repeated.
4. On the back of the
paper, explain the forces
you chose.
Bikers
Or bikes
Choose three pictures from a magazine.
No computer printouts or drawings. Cut each
picture into a square. Identify your square. Find
out which two forces act on the picture. Then
draw two arrows and label each force. Your cut
and paste project should now look like a free
body diagram.
Repeat the same instructions for your second
and third picture. One force can be repeated in
all three pictures. The remaining four forces is
used once.
CREATE A FREE BODY DIAGRAM
1. Cut out three pictures
from magazines
2. Label each picture and
the two forces.
3. You may repeat
two forces twice. The
remaining four forces is
used once.
Bikes or bikers
CREATE A FREE BODY DIAGRAM
1. Cut out three pictures
from magazines
2. Label each picture and
the two forces.
3. One force may be
repeated. The remaining
four forces is used once.
Bikes or bikers
Reflections
date
Which assignments prepared you for the Free
Body Diagram Project? Explain. (do now, lab,
word problems)