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Physics

Physics. Energy and matter interact through forces that result in changes in motion. Objective. Describe different patterns of motion of objects. Motion is Relative.

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Physics

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  1. Physics Energy and matter interact through forces that result in changes in motion.

  2. Objective • Describe different patterns of motion of objects.

  3. Motion is Relative • The motion of an object is always judged with respect to some other object or point. The idea of absolute motion or rest is misleading.

  4. Speed and Velocity • The motion of an object can be described by its position, direction of motion, and speed.

  5. Net Force • An object’s motion is the result of the combined effect of all forces acting on the object.

  6. Newton’s First Law • A moving object that is not subjected to a force will continue to move at a constant speed in a straight line. • An object at rest will remain at rest.

  7. Newton’s First Law

  8. Newton’s Second Law • Force is directly related to an object’s mass and acceleration. • The greater the force, the greater the change in motion.

  9. Newton’s Second Law

  10. Newton’s Third Law • For every action there is an equal and opposite reaction

  11. Objective • Observe, describe, and compare effects of forces (gravity, electric current, and magnetism) on the motion of objects.

  12. Gravity • Every object exerts gravitational force on every other object.

  13. Gravity • Gravitational force depends on: • mass of the objects • how far apart the objects are

  14. Gravity • Gravitational force depends on: • mass of the objects • how far apart the objects are

  15. Gravity • Gravitational force depends on: • mass of the objects • how far apart the objects are

  16. Orbit • Gravity is one of the forces acting on orbiting objects

  17. Projectile Motion • Gravity is one of the forces acting projectiles.

  18. Electromagnetism • Electric currents and magnets can exert a force on each other.

  19. Machines • Machines transfer mechanical energy from one object to another.

  20. Friction • Friction is a force that opposes motion. FRICTION

  21. Lubricants • A machine can be made more efficient by reducing friction. • Some common ways of reducing friction include lubricating or waxing surfaces.

  22. Machines Make Work Easier • Machines can change: • the direction • amount of force • the distance or speed of force required to do work.

  23. Machines Make Work Easier

  24. Simple Machines • Simple machines include a lever, a pulley, a wheel and axle, and an inclined plane.

  25. Complex Machine • A complex machine uses a combination of interacting simple machines, example: a bicycle.

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