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The Physics of Motion and Energy - 8th Grade
Transcript of The Physics of Motion and Energy - 8th Grade
Page 29 in ISN - Page 338-355 in Textbook
By: Mr. Begoyan
Avid EQ: How do we measure movement?
An object is in
if its distance from another object is changing.
is used as a comparison for objects in motion.
Motion is relative and can change depending on what point of reference is chosen.
Example: When you are sitting down in a chair in this classroom, you are still moving, either in reference to the moon, in reference to the sun, in reference to other planets, in reference to the center of our galaxy, or in reference to other galaxies.
is the total length of the path between 2 points.
is the length and direction of a straight line between 2 points.
is a quantity that consists of both a magnitude and a direction.
Displacement is a vector, distance is not.
SPeed and Velocity
of an object is the distance the object travels per unit of time.
Speed is rarely constant.
The average speed is calculated by dividing the total distance by the total time it took to cover the distance.
is the rate at which an object is moving at any given time.
) is speed in a given direction.
Velocity is also a vector.
What is a reference point?
How is distance different from displacement?
What is a vector?
How do you calculate speed?
Why does velocity qualify as a vector?
The slope (rise/run) of a time vs. distance graph represents speed.
is the rate at which velocity changes with time.
is the change in speed (increase or decrease) or a change in direction.
Increasing speed (positive acceleration)
Decreasing speed (negative acceleration)
Change in direction (no speed change).
is calculated by finding the change in velocity per unit of time.
can be graphed in 2 ways.
1. The slope of a speed vs time graph.
2. The curve formed by distance vs time graph.
is done when an object is moved a certain distance.
is the ability to do work.
An object in motion has
Kinetic energy depends on both mass and speed.
Kinetic Energy =
is stored energy that can do work.
Gravitational potential energy
is based on an object's weight and its height relative to a reference point.
Elastic potential energy
is contained in objects that have been stretched or compressed.
Chemical potential energy
is stored in chemical bonds that can be broken to generate energy.
An object 's combined kinetic and potential energy is called
Energy is routinely transformed from one type to another.
The most common transformation is to
law of conservation of energy
states that energy can not be created or destroyed, only transformed.
Fuel - 100%
(chemical potential energy)
Kinetic energy - 25%
Heat - 75%
What are the 2 ways to graph acceleration?
How are work and energy related?
What are the different types of potential energy?
How are potential, kinetic and mechanical energy related?
What does the law of conservation of energy state?
On page 28, describe (to a 5th grade audience, so use visuals and colors along with words) the following concepts:
1. Distance vs Displacement.
2. Reference points.
3. Potential vs Kinetic energy.