Department of Mathematics and Science FORCE & MOTION Mary Tweedy Science Curriculum Support...

Department of Mathematics and Science

FORCE & MOTION

Mary Tweedy

Science Curriculum Support Specialist


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-on-one, in groups, and teacher-led) with diverse partners on grade 5 topics and texts, building on others’ ideas and expressing their own clearly.


What is MOTION?

• Always a change in the position of an object.• Sometimes it may involve a change in direc

tion, 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

http://glencoe.mcgraw-hill.com/sites/dl/free/0078600472/161752/00035803.html

http://studyjams.scholastic.com/studyjams/jams/science/forces-and-motion/force-and-motion.htm


Forces Are All Around Us • 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 • 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.

• What force can affect the pull of gravity?• Air resistance or friction• How does the force of friction impact an object’s motion?• Friction slows down or stops moving objects.

http://www.planetseed.com/laboratory/experiment-air-resistance

http://www.seed.slb.com/labcontent.aspx?id=10206&terms=Galileo


What are forces?GravityFriction

Air ResistanceA push or a pull

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FORCES IN ACTION Grade 5 Quarter 1

Essential Lab # 3


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 Review1. 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?


FCAT Review2. 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.


FCAT Review3. 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. Gravityb. Magnetismc. Pulld. push


FCAT Review4. 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

overcome gravity.


FCAT Review5. 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. gravity and magnetismb. speed and frictionc. friction and gravity d. push and pull

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