standard eps shell presentation - wordpress.com › 2018 › 02 › ... · standard eps shell...
TRANSCRIPT
![Page 1: Standard EPS Shell Presentation - WordPress.com › 2018 › 02 › ... · Standard EPS Shell Presentation Author: Kathleen Woodring Created Date: 2/13/2018 1:02:58 PM](https://reader034.vdocuments.us/reader034/viewer/2022052612/5f0c7f417e708231d435b297/html5/thumbnails/1.jpg)
WARM UP
• Fill out the chart to show your understanding of
MASS, WEIGHT, and GRAVITY
MASS WEIGHT GRAVITY
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THE CAUSE OF FORCES
• A force is an action that has the ability to
change motion. It is a push or pull
• Forces can increase or decrease the speed of a
moving object.
• Forces can also change the direction in which
an object is moving.
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FOUR ELEMENTAL FORCES
All forces in the
universe come
from only four
basic forces.
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UNIT OF FORCE
• The newton (N) is a metric unit of
force.
• 1 pound (lb) equals 4.448 N.
• If one pound of force equals 4.448
newtons, then a 100 lb person weighs
444.8 newtons
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STRONG NUCLEAR FORCE
• This force holds the nucleus
of an atom together.
• This is a very strong force
but only reaches a short
distance.
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ELECTROMAGNETIC FORCE• The electromagnetic force acts between
charged particles – protons and neutrons -
and is the combination of all electrical and
magnetic forces.
• This force holds atoms together in
molecules.
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WEAK FORCE• The weak force is stronger than gravity, but
it is only effective at very short distances.
• Causes Radioactive Decay
• Only occurs at a subatomic level
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GRAVITY
• The force of gravity on an object is called weight.
• At Earth’s surface, gravity exerts a force of 9.8 N on every kilogram of mass.
![Page 9: Standard EPS Shell Presentation - WordPress.com › 2018 › 02 › ... · Standard EPS Shell Presentation Author: Kathleen Woodring Created Date: 2/13/2018 1:02:58 PM](https://reader034.vdocuments.us/reader034/viewer/2022052612/5f0c7f417e708231d435b297/html5/thumbnails/9.jpg)
WEIGHT VS. MASS
• Weight and mass are
not the same.
• Mass is measured in
kilograms (kg).
• Weight is a force
measured in newtons
(N).
• Weight depends on
mass and gravity.
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CALCULATING WEIGHT
Direct Relationship
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SOLVING PROBLEMS
• Calculate the weight of a 60-kilogram person (in newtons) on Earth and on Mars.
1. Looking for: – …weight of person in newtons on both
planets– Given: – …mass = 60 kg; g = 3.7 N/kg on Mars; – …implied g = 9.8 N/kg on Earth
2. Relationships: – W = m x g
3. Solution: – 60 kg x 9.8 N/kg = – 60 kg x 3.7 N/kg =
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CONTACT FORCES
• Contact force. ... Pushing a car up a hill or kicking
a ball or pushing a desk across a room are some of
the everyday examples where contact forces are
at work.
• Examples of contact forces are applied,
gravitational, normal and frictional
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APPLIED FORCE
• An applied
force is
a force that
is applied to an
object by a person
or another object.
A person is pushing a desk
across the room, is
applying a force upon
the object. The applied
force is the force exerted
on the desk by the person.
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GRAVITATIONAL
The force of
attraction between all
masses in the
universe; especially
the attraction of the
earth's mass for
bodies near its
surface.
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NORMAL FORCE
The normal
force is the
support force exert
ed upon an object
that is in contact
with another stable
object.
For example, if a book
is resting upon a
surface, then the
surface is exerting an
upward force upon
the book in order to
support the weight of
the book.
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FRICTIONAL FORCE
Frictional
Force refers to
the force
generated by two
surfaces that
contact and slide
against each other.
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WE DO
Force Review Activities
(~ 20 min each activity)
• 4 Fundamental Forces Chart
• Mass/Weight/Gravity Practice
• Phy Sci Textbook Review Qs