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Forces and Motion

Immune System






Alg HW


Sci HW

Extra Credit


Forces and Motion Content Standards


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8.1 - An objectís inertia causes it to continue moving the way it is moving unless it is acted upon by an outside force to change its motion.

Law 1: Inertia

a)      The motion of an object can be described by its position, direction of motion and speed.

Average Speed

b)      An unbalanced force acting

on an object changes its speed and/or direction of motion.

Unbalanced Force

What is a force?

c)      Objects moving in circles must experience net force acting toward the center.

Centripetal Force


Expected Performances


C 22. Calculate the average speed of a moving object and illustrate the motion of objects in graphs of distance over time.

Average Speed

Velocity of a Line

Position Time Graphs

Average Acceleration

C 23. Describe the qualitative relationships among force, mass and changes in motion.

Law 2: F=ma

Asking Testable Questions

C 24. Describe the forces acting on an object moving in a circular path.

Centripetal Force

Law 3: Action/Reaction




Physics formulas

Some Vocabulary

How can anything move?

Motion Links

Cool Physics Questions

Tee hee

Review Games


Grade Level Expectations:

  1. Use appropriate tools and techniques to make observations and gather data to determine how forces, including friction, act on an object to change its position over time in relation to a fixed point of reference.
  2. Calculate the average speed of a moving object, and distinguish between instantaneous speed and average speed of an object.
  3. Create and interpret distance-time graphs for objects moving at constant and nonconstant speeds.
  4. Predict the motion of an object given the magnitude and direction of forces acting on it (net force).
  5. Investigate and demonstrate how unbalanced forces cause acceleration (change in speed and/or direction of an objectís motion).
  6. Assess in writing the relationship between an objectís mass and its inertia when at rest and in motion.
  7. Express mathematically how the mass of an object and the force acting on it affect its acceleration.
  8. Design and conduct an experiment to determine how gravity and friction (air resistance) affect a falling object.
  9. Illustrate how the circular motion of an object is caused by a center-seeking force (centripetal force) resulting in the objectís constant acceleration.



"The tides are a fight between the Earth and moon. All water tends towards the moon, because there is no water in the moon, and nature abhors a vacuum. I forget where the sun joins in this fight."

"Vacuum: A large, empty space where the pope lives."

These comments come from test papers and essays submitted to science and health teachers by elementary, junior high, high school, and college students and compiled at the NEA Life Sciences Symposium, Kansas City, Kansas. As the originator noted, "It is truly astonishing what weird science our young scholars can create under the pressures of time and grades." Please note that the original spelling has been left intact.

Mr. Hand's 8th Grade Science Site