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TRANSCRIPT
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5th Grade ScienceEOG Review Mini Lessons
Crash course in exactly what you need to know to be successful on the 5th grade Science EOG.
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Force and Motion
::
Newton’s Laws of Motion and Predicting Motion
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Forces.- a force is a push or pull.
- measured in Newtons
- symbolized with arrows to show their strength and direction.
2 N
10 N
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Balanced Forces
●Balanced forces don’t change motion●Cancel each other out
50 N left 50 N right
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Unbalanced Forces●Forces that don’t have the same strength don’t cancel each other out, and change motion
●Objects accelerate in direction of stronger force
100 N left 50 N right
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• MASS = the amount of matter in an object
• WEIGHT = the force of gravity acting on an object, will change if the force of gravity changes (ex. Walking on the moon).
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Gravity●Reason why things fall to the ground
●Gravity acts even when the objects don’t touch
●Pulls objects downward
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Friction
●Friction●A force that acts in the opposite direction of the motion of the object (slows object down)
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Air Resistance
●Interaction between the surface of a moving object and air molecules
●Type of friction●Size, shape of object and speed affect
●Larger objects ●Faster moving objects
●More air resistance
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Newton’s 1st Law
• An object in motion will stay in motion and an object at rest will stay at rest UNLESS acted upon by an unbalanced force.
• Plane flying through air?
• Hockey puck on ice?
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Newton’s 1st Law
• This is sometimes called the Law of Inertia.
• INERTIA = the tendency of an object to resist a change in motion.
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unbalanced force = ?
balanced force = ?
“An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.”
Newton’s 1st Law of Motion
change in motion
no change in motion
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*Thought Questions
1. You’re driving and you brake suddenly.
What happens to your body?
2. You speed up suddenly.
What happens?
3. You turn left.
What happens?crash dummy test
+write: explain how Newton’s 1st Law applies
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Newton’s 2nd Law• Describes the relationship between force,
acceleration, and mass.
• Which would you have to apply more force to in order to slide it across the room?: a box of 30 lbs. of textbooks or a box with 60 lbs. of textbooks?
• Which would slide a further distance if you pushed with the same amount of force?: a box of 30 lbs. of
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The more MASS an object has, the greater the FORCE required to change
its motion!
Translation?
(Heavier objects are harder to move than light objects. Duh!)
In official terms...
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The greater the FORCE applied to an object, the greater the ACCELERATION!
Translation?
(The harder you push something, the farther it will go. Duh! )
In official terms...
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Newton’s Third Law
• Forces always exist in pairs.
• If you get mad and punch the wall, you are applying a force to the wall.
• Why does this hurt your hand?
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Newton’s Third Law
• Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.
• Your hand supplied the action force. The wall returned an equal and opposite reaction force. Ouch!
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Force and Motion
::
Calculating Speed
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Formula for Calculating Speed
Speed= distance timeSpeed= how fast object is moving
Distance= how far object has moved
Time= how long it traveled
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Describe each car’s motion. Explain.(Vocabulary: constant speed, acceleration).
-Diagrams-
A.
B.
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Examples
If a person moves 30 meters in 2 seconds, what is its speed?
It takes a car 4 hours to travel 160 miles. How fast was it traveling?
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Position Diagrams
Which car is moving at a constant speed?
Which car is decelerating/slowing down?
Which car is accelerating/getting faster?
A.
B.
C.
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Force and Motion
::
Distance/Time Graphs
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DISTANCE-TIME GRAPHS
●A distance-time graph shows an object’s motion
Y-axis
X-axis
It shows how long it takes an object to travel
a certain distance!
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DISTANCE-TIME GRAPHS
What can you calculate using distance and
time?
SPEED!
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DISTANCE-TIME GRAPHS
●A straight line shows an object moving at a constant speed
●The steeper the line, the faster the object is moving
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Which object is faster?
A B
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DISTANCE-TIME GRAPHS
Work out the
speed for each
object shown
in the graph!
Remember:
speed = distance ➗ time
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STATIONARY OBJECTS!
●A flat, horizontal line shows a stationary object
●This means the object is NOT moving.
●Time keeps moving, distance stays the same
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ACCELERATING OBJECTS
●Curved lines show if an
object is accelerating or
decelerating!
●The steeper the line
gets the faster the
object is moving!
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What is happening between C and D?
Changing Direction
The line is sloping DOWN. This means that the objects changed direction and it is heading back to the starting point.
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GRAPH QUESTIONS
●1. What is the speed of the man during the first three seconds?
●2. What is the man doing between 3 and 5seconds?
●3. Calculate the speed of the man between 5 and 7 seconds.
●4. What is the total distance that he has moved?
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● STRAIGHT LINE = CONSTANT SPEED○ THE STEEPER THE LINE, THE FASTER THE MOTION!!!
● FLAT LINE = STOPPED/STATIONARY/NOT MOVING● CURVED LINE = ACCELERATING/CHANGING SPEED
● SLOPED DOWN=GOING BACK TO START (CHANGING DIRECTION)
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Matter
::
Water Cycle
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The Water Cycle (also known as the hydrologic cycle) is the journey water takes as it circulates from the land to the sky and back again.
These are the stages of the water cycle:
Evaporation and Transpiration
Condensation
Precipitation
Collection
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The sun is the energy source that drives the water cycle.
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Evaporationwhen the sun heats up a collection of water, it turns into
vapor or steam as it rises into the air.
Watch this video to see an example of evaporation.
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Transpirationthe evaporation of water from plants.
Just as water evaporates from collections of water, it can also evaporate off of the leaves of trees and plants.
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Condensationwater vapor in the air gets cold and changes back into liquid water droplets in the air. This is how clouds are
formed.
Watch this video clip to further your understanding.
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Precipitationa form of water that falls to the Earth’s surface when so much water has condensed that the drops become heavier
than the surrounding air.
Rain
SnowHail
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Collectionwhen water falls to the earth as precipitation, it collects in oceans, lakes,
icebergs, puddles, rivers and streams.
Oceans Lakes Icebergs
Puddles Rivers Streams
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Matter
::
Law of Conservation of Mass
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Law of Conservation of Matter/Mass
Matter cannot be CREATED or DESTROYED...only changed.
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States of MatterSOLIDS
A SOLID is matter that has a defined shape and will not lose its shape.
FIXED VOLUME AND FIXED SHAPE
Examples of solids:1.Chair2.Table3.Golf Ball4.Hockey Puck5.Glass Jar
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States of MatterLIQUIDS
A LIQUID is matter that will take the shape of any container it is placed in put has a fixed volume.
Examples of LIQUIDS:1.Water2.Soda3.Milk4.Juice5.Tomato Sauce
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States of MatterGASESA GAS is matter that does NOT have a fixed shape or volume, but will
completely take up all the space in a container.
MOST GASES ARE INVISIBLE!!!!
Examples of GASSES:1.Oxygen 2.Helium3.Carbon Dioxide4.Nitrogen5.Carbon Monoxide
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WEIGHTTHE WEIGHT OF AN OBJECT
=THE SUM OF THE WEIGHT OF ITS PARTS
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WEIGHT
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WEIGHT14 OZ 20 OZ
32 OZ
8 OZ
20 OZ
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DiscussionEight ounces of water is poured into an ice cube tray and
frozen. Determine the weight of the new object, what type of
change occurred, and what state the object is in after the change.
8 OZ