Transcript SC_5_P_13_1 Force and Motionx

FORCE & MOTION
Mary Tweedy
Science Curriculum Support Specialist
Department of Mathematics and Science
Topic 7: Forces and Changes in Motion
Benchmarks
• SC.5.P.13.1 Identify familiar forces that cause objects to move, such as pushes
or pulls, including gravity acting on falling objects.
• SC.5.P.13.2 Investigate and describe that the greater the force applied to it, the
greater the change in motion of a given object.
• SC.5.P.13.3 Investigate and describe that the more mass an object has, the less
effect a given force will have on the object's motion.
• SC.5.P.13.4 Investigate and explain that when a force is applied to an object but
it does not move, it is because another opposing force is being applied by
something in the environment so that the forces are balanced.
• SC.5.N.2.1 Recognize and explain that science is grounded in empirical
observations that are testable; explanation must always be linked with
evidence.
• LACC.5.SL.1.1 Engage effectively in a range of collaborative discussions (one-onone, in groups, and teacher-led) with diverse partners on grade 5 topics and
texts, building on others’ ideas and expressing their own clearly.
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What is MOTION?
• Always a change in the position of an object.
• Sometimes it may involve a change in
direction, too.
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What changes motion?
• Motion of an object changes when a force acts
upon the object.
• An object remains in motion, or at rest, unless
a force acts on it.
Object in
motion
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Forces Are All Around Us
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What are forces?
A push or a pull
What happens when you hold up a book and drop it?
Why did this happen?
What happens when you drop two books with different masses?
Will they land at the same time or different times?
• Does this work every time with any two objects?
• What happens if you drop a book and a piece of paper at the same time?
Let’s visit
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http://www.planetseed.com/laboratory/experiment-air-resistance
http://www.seed.slb.com/labcontent.aspx?id=10206&terms=Galileo
Galileo found any two objects will land at the same time. Earth’s gravity will pull harder on
the object with the greater mass and the one with the smaller mass will have less force of
gravity acting on it.
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What force can affect the pull of gravity?
Air resistance or friction
How does the force of friction impact an object’s motion?
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Friction slows down or stops moving
objects.
What are forces?
Gravity
Friction
Air Resistance
A push or a pull
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FORCES IN ACTION
Grade 5 Quarter 1
Essential Lab # 3
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Balanced Forces Versus Unbalanced Forces
About Force
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What conditions can affect
force and motion?
Amount of mass
Type of force applied
Type of surface texture
Surface area
Moon
Earth
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FCAT Review
1. Jordan makes the following list of choices for the
science fair. Which choice would be scientifically
testable?
A. What do 5th graders think of playing tug of war?
B. Which type of stone is the best looking in my
rock collection?
C. Does a ball roll farther on grassy PE field or on a
asphalt basketball court?
D. Is Mrs. Jones a nicer teacher than Mr. Mathews?
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FCAT Review
2. Ricardo is conducting an experiment to see how
far a rubber ball will roll when he releases it at the
top of an inclined plane. Why does the ball speed
up as it travels down the inclined plane?
A. The force of gravity pulls the ball down the
inclined plane.
B. The force of friction is reduced because the ball
is rubber.
C. The ball has less magnetic attraction to the
plane as it travels.
D. The ball has a greater mass as it travels faster.
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FCAT Review
3. Charlene kicked the winning goal in her last
soccer game. What force acted between Charlene's
foot and the ball to cause the ball to move?
a.
b.
c.
d.
Gravity
Magnetism
Pull
push
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FCAT Review
4. Tiffany is helping her parents to unpack some boxes. She
lifts a full box with a mass of 15 kilograms. She empties out
about half of the items from the box and lifts it again. Which
is true regarding the force she applies after unloading the
box?
A. She has to apply a different type of force after changing
the mass.
B. She has to apply more force to lift the box because the
mass is greater.
C. She has to apply less force to lift the box because the
mass has decreased.
D. She has to apply the same amount of force to the box to
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overcome gravity.
FCAT Review
5. Maria roller skates to the top of a hill and then
starts rolling downward. What are the MAIN forces
affecting Maria’s motion as she rolls down the hill?
a.
b.
c.
d.
gravity and magnetism
speed and friction
friction and gravity
push and pull
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