Forces!

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Forces!
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What Is Force?
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It takes a force to move something.
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A force is a push or a pull . . .
that causes an object to move, stop, or change
direction.
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When you push an object, it moves away from you.
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When you pull an object, it moves toward or with
you.
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Is this a push or a pull?
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Is this a push or a pull?
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Is this a push or a pull?
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Is this a push or a pull?
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Is this a push or a pull?
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Is this a push or a pull?
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Is this a push or a pull?
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Is this a push or a pull?
What is the pulling force called?
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Some Types of Forces

• Gravity

• Friction

• Magnetism

• Erosion (wind and water)

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• Gravity

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• Gravity

the force that pulls all objects in the universe
towards each others center.
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• Gravity

The mass of an object determines how much gravity
that object has. For example
The moon and Earth are pulling on each other.
The Earth is bigger than the moon so its
gravitational pull is stronger. That is why the
moon orbits the Earth. What would happen if the
moon was bigger than the Earth?
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• Friction

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• Friction . . .

a force that acts against something when two
surfaces rub against each other.
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A softball player sliding into home on the rough
dirt has a lot of friction and can stop.
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A sled on smooth ice will keep sliding and is
hard to stop because it has only a little
friction.
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What causes the leaves to fall to the ground
during the Autumn season?
magnetism
push
gravity

• What causes the leaves to fall to the ground
  during the autumn season?
• Magnetism
• A pushing force
• Gravity
• Erosion

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What causes the leaves to fall to the ground
during the Autumn season?
magnetism
push
gravity

• The moving of an object is called --
• force
• friction
• magnetism
• gravity

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What causes the leaves to fall to the ground
during the Autumn season?
magnetism
push
gravity
Which of the following is an example of a force
that is different from gravity? A. an apple
dropping to the floor B. a boy slamming a
door C. a leaf falling to the ground D. water
dripping from a faucet
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What causes the leaves to fall to the ground
during the Autumn season?
magnetism
push
gravity
What force is represented in the above
picture? A. A pushing force B. A pulling
force C. A magnetic force D. Both A and C
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May the Force Be With You Activity Stations
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Station 1Building a Card House You must use
build a card house using All of the cards in the
deck. The house must be a minimum of 5 stories
high with 3 rooms on each floor.
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Station 2 Marble Motion and Forces Build a ramp
and roll a marble down a ramp. At the end of the
ramp the marble pushes a cup until it stops on
graph paper.
Instructional Video
http//www.doingscience.org/physical-science-1-2
-3/marbles-forces-and-motion
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Station 3 Force and Friction Lab Pull the
following materials with the spring scale and
record your information
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Station 4 Kerplunk! The object is to not let
gravity pull the marbles to the tray!
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Station 5 FORCE MOTION AND FRICTION RAMPS Use
the 3 ramps to record how a toy car moves along
different surfaces.