1. Physical Science: Chapter 11, Section 3
Motion & Force

2. Forces A force is an action on an object that can ___
_______________________________________.
Contact Forces: ___________________________
__________________________________________
Field Forces: ______________________________
Examples of Field Forces
________________________________ and
__________________________.

3. Forces Four Fundamental Forces:
1. ___________________________: ___________
_________________________________________
2. ___________________________: ___________
__________________________________________

4. Forces Four Fundamental Forces:
3. ___________________________: ___________
_________________________________________
4. ___________________________: ___________
__________________________________________

5. Physical Science: Chapter 11 Section 3 Motion & Force
Mini-Quiz #5
1). What is a force?
2). What are contact forces?
3). What are field forces?
4). Which fundamental forces of
nature are field forces?

6. Forces
________________________Forces
If all the forces are _______________, there is no “______” force and there is ____________________________________.
____________________________Forces
If the forces are ________________, the “_____” force causes a _____________in the __________________.

7. Physical Science: Chapter 11 Section 3 Motion & Force
FRICTION
_________ is a force that “_________”
motion; it works in the
___________________________
of a ______force
applied to an
object to get it
to ____________.

8. Friction
Friction in machines _____________ their ________________, making them more expensive to use and wearing them out faster.
Friction in machines can be reduced by using _________________, like oil.

9. Friction
Friction is not always a ______thing. Friction is needed for ____________________________
When needed, friction can be increased in two ways:
1. ______________________________________
2. ______________________________________
(example: add weight above the rear wheels to increase traction.)

10. Two Types of Friction _____________________ Friction
The force that works between two surfaces that are ___________and at ______(____________).
_____________________ Friction
The force that works between two _________ objects (or one that is ________and one that is __________________________).

11. Physical Science: Chapter 11 Section 3 Motion & Force
Kinetic Friction
There are two types of ____________friction:
_________ Friction __________ Friction

12. Physical Science: Chapter 11 Section 3 Motion & Force
THINGS TO KNOW
What is a force?
What are contact and field forces.
What two forces of nature are field
forces?
What happens to objects when the
forces on them are balanced?

13. Physical Science: Chapter 11 Section 3 Motion & Force
THINGS TO KNOW
What is friction?
What are TWO ways you can
increase friction?
How can you reduce unwanted
friction?

14. Physical Science: Chapter 11 Section 3 Motion & Force
THINGS TO KNOW
What are the two types of
kinetic friction?
Which type of kinetic friction is
higher, sliding or rolling?
Which type of friction is higher,
static or kinetic?

15. Physical Science: Chapter 11 Section 3 Motion & Force
Chapter 11, Section 3 QUIZ
1). What is a force?
2). What is a contact force?
3). What two forces of nature are
field forces?
4). What happens to objects when
the forces on them are NOT
balanced?
5). What is friction?
6). What are TWO types of friction?

16. Physical Science: Chapter 11 Section 3 Motion & Force
Chapter 11, Section 3 QUIZ
7). What are TWO ways you can
increase friction?
8). What are TWO types of
kinetic friction?
9). List TWO parts of a car that
would work better without
friction?
10). List two parts of a car that
NEED friction.