Download Connecting Motion with Forces

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Connecting Motion with Forces
Types of Forces
What is a force?
A force is a __________________ or a ________________ one object exerts on another.
Types of Forces on Objects
There are a variety of forces. Below are 5 kinds of different forces.

Fair
=
special type of frictional force that acts upon objects as they travel through air;
usually opposes motion

Fapplied = force applied by a person or another object; can be a push or a pull
Ffriction = frictional force as one object touches across another; usually opposes motion
Fnormal = support force exerted upon an object that’s in contact with another stable object
Fgravity = a downward force with which Earth, moon, or other massively large object



attracts another object toward itself; also known as weight
Examples of Forces

Fair
o
o

Fapplied
o
o

Ffriction
o
o

Fnormal
o
o

Fgravity
o
o
Labeling Force Practice
Based on the description of the 5 types of forces listed in your notes, list the types of forces in each
situation and what they are doing to the object. The numbered lines tell you how many forces are
found in each event.
1.
2.
3.
1. A dinner plate is at rest on the kitchen table.
2. An egg is accelerating straight downward from a
nest in a tree. No wind is present.
1. ______________________________
1. ______________________________
______________________________
______________________________
2. ___________________________ ___
2. ___________________________ ___
_____________________________
_____________________________
3. A sky diver is descending with a constant
velocity. Her parachute is not open yet.
4. Cole pushes his book across the table toward the
right. Neglect air resistance.
1. ______________________________
______________________________
1. ______________________________
_________________________ _____
2. ___________________________ __
_____________________________
2. __________________________ ___
_____________________________
3. __________________________ ____
___________________ _____ _____
4. ___________________________ ___
__________________________ ___
5. A car is coasting down the road without any
extra applied force to the right and slowing down.
Neglect air resistance.
1. ______________________________
_________________________ _____
2. __________________________ ___
_____________________________
3. __________________________ ____
___________________ _____ _____
6. Emily is being pulled straight forward by Zac &
then makes a right hand turn. Neglect air resistance.
1. ______________________________
_________________________ _____
2. __________________________ ___
_____________________________
3. __________________________ ____
___________________ _____ _____
4. ___________________________ ___
____________ ______________ __
Connecting Motion with Forces
Force Diagrams
Forces are commonly measured in
,
and can be represented as arrows, called
1. The length of the
2. The direction of the
, or
.
indicates the ______________________ of the force.
indicates the ______________________ of the force.
Force Diagrams
Force Diagram – a diagram that shows all the ____________________ acting on an object.
The object is shown as a __________________________.
The vectors indicate the relative magnitude (_____
_____) and _______________ of the force.
The vectors are drawn pointing ________________________ from the object.
Forces in the same direction are
from each other.
together while forces in opposite directions are
The total force acting on an object is called a
force.
Examples of Force Diagrams
5N
2N
10N
Fapplied
5N
This force diagram represents a box sitting on the floor that’s being pushed toward the right.
1.
The horizontal forces acting on the box are:
a. Fapplied is causing ________________N of force toward the
.
b. Ffriction is causing _______________N of force toward the
.
c. Results in a horizontal ____________ force of ________N of force toward the ___ ______.
2.
The vertical forces acting on the box are:
a. Fgravity is causing ________________N of force
b. Fnormal is causing _______________N of force
c. Results in a vertical ____________ force of ________N of force.
3.
.
.
Draw a force diagram below that represents ONLY the net forces acting on the above object
Drawing Force Diagrams Practice
1. Based on your answers to Labeling Force Practice, draw a force diagram for event #1, #4, and #6
below.
2. Label the forces as one of the 5 types of forces.
3. Draw a net force diagram for each event.
Force Diagrams
Net Force Diagrams
1. A 5N dinner plate is at rest on the kitchen table.
4. Cole pushes his 10N book across the table toward the
right with 30N of force. Fair is 0N and Ffriction between
the surface of the book and the table top is 0.5N
6. A 667 N (150 lb) person is being pulled on a cart
toward the left with 999N of force. Fair is 1N and
Ffriction between the cart’s wheels and the ground
3N.
Connecting Motion with Forces
Balanced and Unbalanced Forces
Effects of Forces on Objects
Balanced Forces
1. Forces that
change velocity are called balanced forces and are
_______________ in magnitude and ______
___
____ in direction with a
net force.
2. Some examples of balanced forces are
a. ________________________________________________
b. ________________________________________________
c. An example of balanced forces drawn as vectors is below.
d. An example of a force diagram of the above book that is not moving:
Fnormal
e.
Force diagram of a person walking at a constant speed looks like
f. Force diagram of a bird suspended in the air looks like
Unbalanced Forces
1. Forces that
change the velocity of an object are called unbalanced forces
and cause a non-zero __________
__force on the object.
2. A non-zero net force on an object ____________________ changes the velocity of an object.
3. Remember that velocity changes (net forces) are a result in changing the _________________,
___________________
_____, or
.
4. Some examples of unbalanced forces are
a. ________________________________________________
b. ________________________________________________.
c. An example of unbalanced forces drawn as vectors is below.
d. An example of a force diagram of the above accelerating book is
Fnormal
e.
Force diagram of a person accelerating toward the right looks like
f. Force diagram of a bird falling accelerating downward through the air looks like
Balanced and Unbalanced Force Practice
Based on ALL your notes about forces, circle whether each event has balanced forces or unbalanced
forces. Tell how you know.
1. A dinner plate is at rest on the kitchen table.
Horizontal forces
Vertical forces
Horizontal forces
Vertical forces
Balanced forces
Balanced forces
Balanced forces
Balanced forces
Unbalanced forces
Unbalanced forces
Unbalanced forces
Unbalanced forces
I know this because…
 Horizontal forces

4.
5.
6.
2. An egg is accelerating straight downward from a
nest in a tree. Neglect air resistance.
I know this because…
 Horizontal forces

Vertical forces
3. A sky diver is descending with a constant
velocity. Her parachute is not open yet. Neglect
air resistance.
Horizontal forces
Vertical forces
Vertical forces
4. Cole pushes his book across the table toward
the right. Neglect air resistance.
Horizontal forces
Vertical forces
Balanced forces
Balanced forces
Balanced forces
Balanced forces
Unbalanced forces
Unbalanced forces
Unbalanced forces
Unbalanced forces
I know this because…
 Horizontal forces

I know this because…
 Horizontal forces

Vertical forces
5. A car is coasting down the road without any
extra applied force to the right and slowing
down. Neglect air resistance.
Horizontal forces
Vertical forces
Vertical forces
6. Emily is being pulled straight forward by Zac &
then makes a right hand turn. Neglect air
resistance.
Horizontal forces
Vertical forces
Balanced forces
Balanced forces
Balanced forces
Balanced forces
Unbalanced forces
Unbalanced forces
Unbalanced forces
Unbalanced forces
I know this because…
 Horizontal forces

Vertical forces
I know this because…
 Horizontal forces

Vertical forces
Forces Review
1. List the 5 types of forces we learned about?
1)
2)
3)
4)
5)
2. Your race car is sitting still on the floor.


Draw a force diagram to show all the forces acting on the car. Be sure to
label all the forces as one of the 5 from question #1.
Label the force diagram as balanced forces or unbalanced forces.
3. You push your race car and it begins to move toward the left.


Draw a force diagram to show all the forces acting on the car as it begins to
move. Be sure to label all the forces as one of the 5 from question #1.
Label the force diagram as balanced forces or unbalanced forces.
4. Your race car begins to slow down as you are no longer pushing it.


Draw a force diagram to show all the forces acting on the car. Be sure to
label all the forces as one of the 5 from question #1.
Label the force diagram as balanced forces or unbalanced forces.