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Forces in Motion: Understanding Nature, Balance, and Gravity

This video explores the nature of forces, including push and pull, friction, balanced and unbalanced forces, Newton's laws of motion, gravity, weight, and mass. Learn how these concepts affect motion and discover practical examples.

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Forces in Motion: Understanding Nature, Balance, and Gravity

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Presentation Transcript

  1. Chapter 13 Forces Video #34(what is a force)

  2. 13-1 Nature of Forces *Force: push or pull -gives nrg to an object

  3. Video #37(espn that mu you do) -Newton said an object in motion stays in motion unless acted upon by an outside force (1st law of motion) *Friction: force that opposes the motion

  4. -sliding friction *when two solid surfaces slide over each other -amount depends on two factors 1. Weight 2. Types of surfaces

  5. -rolling friction *object rolls over a surface -oppose motion less than sliding ex: wheels and ball bearings

  6. -fluid friction *object moves through a fluid -all liquids and gases are fluids -usually opposes motion less than sliding friction *Lubricants: change sliding friction to fluid friction

  7. Video #36 (bed of nails) -friction can be helpful ex’s: ????

  8. 13-2 Balanced and Unbalanced Forces *Balanced forces: opp in direction and equal in size -no change in motion -keeps an object moving at constant velocity

  9. *Unbalanced force: not opp and equal -always cause a change in motion

  10. 13-3 Force and Motionvideo #28 (newtons 3 Laws of motion) • 3 laws of motion explain rest, constant motion, and accelerated motion (Isaac Newton)

  11. -1st Law of Motion *Inertia: tendency of objects to remain in motion or stay at rest -object at rest will remain at rest, and an object in motion will remain in motion, unless acted on by an unbalanced force(ex’s)

  12. -2nd Law of Motion • Force = (mass)(acceleration) N = (kg) (m/s/s) -unbalanced force accel an object in the direction of that force - 1N = 1kg X 1 m/s/s

  13. -3Rd Law of Motion *every action, there is an equal and opposite rxn -all forces come in pairs **Video 51(what if everyone jumped at ) **Scooter Example**

  14. 13-4 Gravity Video #30(brainiac-do heavy ob) Video #31(BrianCox visits vac)

  15. -Free fall -All objects accel at the same rate, regardless of their mass *Gravity: attractive force b/all objects in the universe

  16. -Free fall ~near the surface of earth, accel due to gravity 9.8m/s/s -Any falling object meets air resistance *Terminal vel: no longer accel (120mph)

  17. -Projectile Motion *any object thrown in the air ~is always a curve -Once you release a ball the only force acting on it is gravity

  18. Orbital Motion *object that orbits another object ~it is a result of the object’s forward inertia and the downward pull of gravity on the object

  19. -Newton’s Law of Universal Gravitation *all objects in the universe attract each other by the force of gravity -The size of the force depends on: 1)mass 2)distance b/them

  20. 13-5 Weight and Mass -Weight: measure of the force of gravity on an object ~units: newton (N) ~w = m x g -Mass: amount of matter ~mass is constant

  21. Example • Person runs 100 m, 3 times. The times were as follows: 11.9 sec, 12.2 sec, 11.5 sec. • Find the velocity for each trial • Find the overall average velocity • Find the average acceleration

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