1. What is a Force? Force Newton Net force
Chapter 1, Section 2 (pages 10-13)
Vocabulary:
Force
Newton
Net force

2. A push or
pull!
Force
p. 10

3. Scientists use the unit called “Newton (N)” to express
Newton p. 10
Scientists use the unit
called “Newton (N)” to express
Force!

4. List 5 ways you have exerted
Force today?
1. Pushing the alarm clock button off.
2. Pushing the shower switch
on and off this morning.
9. Pulling your locker open.
10. Pushing your locker shut!
3. Pushing the soap on yourself or
the washcloth.
11. Pushing another person
(stop doing that!)
4. Pushing or pulling your toothbrush.
12. Pushing or pulling a chair
5. Pushing or pulling a comb or brush.
13. Sitting (pushing) on your seat
6. Pulling your covers up
to make your bed
14. Pushing or pulling your note sheet.
7. Pulling your book bag up
on to your shoulder.
15. Pulling your pencil/pen
8. Pulling your books out of the bag
16. Pushing your pencil or pen

5. The Earth and Moon exert an unseen force (gravity) on
There are unseen sources and
receivers of force as well
Gravity
The Earth and Moon exert an
unseen force (gravity) on
each other.
p. 11

6. unseen force is magnetism
Another Example of an
unseen force is magnetism

7. The Earth has
Magnetic fields
as well

8. The combination of all the forces
Net
force
The combination of all the forces
acting upon an object
p. 11

9. Just add them together and include the direction.
Figure out the total net force when force is applied in the same direction
Just add them
together and
include the
direction.
30 N
35 N
Answer:
65 N to the left

10. Forces in Different
Directions p. 12

11. forces are equal (balanced)
Balanced Force p. 12
When the forces
on an object produce
a net force of 0 N, the
forces are equal (balanced)

12. Balanced Force
Here’s another example of A balanced force. Use this illustration to explain the term
“balanced force.”

13. Unbalanced Force p. 13 When the net force is not 0 N.
Produces a change in motion
Necessary to cause a non
moving object to start moving
4. Necessary to change the
motion of the moving object

14. Unbalanced forces Produce a change in motion
Unbalanced forces are necessary to cause a non moving object to start moving
When the net force
is not 0 N.
Unbalanced forces are
necessary to change the
motion of the moving object

15. Contact vs. Non-Contact Forces
Contact forces: There's a contact between two objects, two people or a person and an object.
Contact Forces
Frictional Force
Tension Force
Normal Force
Air Resistance Force
Applied Force
Spring Force

16. NON-Contact Forces Action-at-a-Distance Forces
Non-contact force: no contact takes place
Action-at-a-Distance Forces
Gravitational Force
Electrical Force
Magnetic Force

17. An object at rest will remain
At rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This law is called
“the Law of Inertia.” Newton’s first Law of Motion.