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Mass, Force and Motion

Mass, Force and Motion. 8 th Grade Physical Science. S8P3. Students will investigate the relationship between force, mass, and the motion of objects. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity , inertia , and friction . . What is a force?.

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Mass, Force and Motion

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  1. Mass, Force and Motion 8th Grade Physical Science

  2. S8P3. Students will investigate the relationship between force, mass, and the motion of objects. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction.

  3. What is a force?

  4. Calculating Net ForcesA net force is the total amount of all forces acting on an object.

  5. Addforces moving in the same direction.Subtractforces moving in opposite directions.

  6. BALANCED FORCES vs. UNBALANCED FORCES • Balanced forces are always equal to ZERO and DO NOT cause motion. • Unbalanced forces ALWAYS cause motion and NEVER equal to zero.

  7. FRICTION is a force that works in the opposite direction to motion.

  8. Static Friction vs. Kinetic Friction • Static friction is found where there is NO motion. • Kinetic friction is found where MOTION occurs.

  9. Newton’s 1st Law of Motion

  10. Newton’s 1st Law of Motion or The Law of Inertia states…..An object at rest tends to stay at rest and an object in motion tends to stay in motion unless an unbalanced force acts upon it.

  11. Newton’s 2nd Law of Motion

  12. More on the Law of Acceleration

  13. Newton’s 3nd Law of Motion

  14. According to Newton’s 3rd Law of Motion, Forces Always Come In Pairs (or Twos)

  15. SI (International System) Units of MeasurementWe measure forces in NEWTONS.We measure weight in NEWTONS.Weight is measurement of the FORCEof GRAVITY. Gravity is a major force in the universe!

  16. S8P5. Students will recognize the characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. a. Recognize that every object exerts gravitational force on every other object and that the force exerted depends on how much mass the objects have and how far apart they are.

  17. Gravitational Force

  18. The Force of Gravity and Mass

  19. The Force of Gravity and Distance

  20. S8P3. Students will investigate the relationship between force, mass, and the motion of objects. a. Determine the relationship between velocity and acceleration.

  21. Speed and Velocity Both use the same equation: Speed or Velocity = distance time Velocity has a direction…..Speeddoes notgo in a particular direction.

  22. Velocity and Acceleration

  23. SI (International System)Units of MeasurementWe measure speedin m/s.We measure velocityin m/s.We measure acceleration in m/s2. (Or…meters per second per second.)

  24. S8P3. Students will investigate the relationship between force, mass, and the motion of objects. c. Demonstrate the effect of simple machines (lever, inclined plane, pulley, wedge, screw, and wheel and axle) on work.

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