Transcript Changing the Speed of Motion

DE Science Elementary
“5-Minute Prep” For
Forces and Motion
Motion
Changing the Speed of Motion
Changing the Speed of Motion – The Big Ideas
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Motion is changed by a change in the force acting on
an object.
An object sitting still remains still until a force acts on it.
A moving object continues to move until a force stops it.
A force acting on a moving mass can change its speed
of motion.
A push in the same direction an object is moving
increases the object’s velocity (speed of motion).
A push from the opposite direction in which an object is
moving decreases its velocity (speed of motion).
Friction is a force that slows or stops the motion of a
rolling ball.
Changing the Speed of Motion – Prior Knowledge
Students are fascinated by objects in motion. It
will help for students to use the Fun-damental,
Making Things Move, to review forces and
motion. It will also be helpful if students have:
• observed or interacted with toys and other
objects that change speed while moving.
Changing the Speed of Motion –
Common Misconceptions
• Velocity is a force.
– Reality: Velocity is the rate and direction of the
change in the position of an object. It is not a force.
• If an object has a speed of zero, it has no
acceleration.
– Reality: An object with a zero net force on it is either
at rest or moving with constant speed. An object with
a non-zero net force will change its motion. This may
involve the object speeding up, slowing down and/or
changing direction.
Changing the Speed of Motion –
Using DE Science Content
When you close this presentation, you can review the
following recommended resources for Changing the
Speed of Motion.
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Exploration: Changing the Speed of Motion
Reading Passage: My Writing Journal
Video: Inertia
Video: Forces and Gravity
Use the PowerPoint version of this presentation for
hyperlinks to these resources or you can get to them
through the browser or search feature.
Changing the Speed of Motion –
Instructional Ideas
• Students will work either alone or in pairs at a
computer to complete the virtual lab, Pulling
Your Weight.
– Have the students print out their results page and
hand it in for credit.
• Create a vocabulary scavenger hunt on
changing the speed of motion for your students
based on the glossary terms.
– Students can navigate through the interactive
glossary while answering your questions.
State standards:
If you wish to review your state standards
regarding Motion, click here to get to the
curriculum standards search feature of DES.
http://discoveryeducation.com/forward/curriculum.cfm
You can click on any standard to see what
resources are available to teach it.
Additional Information:
For additional content, check the Extend section
within the concept.