Fuerzas Un Repaso Tarea 1-10 1. Qué es una fueza? Un empujón o jalón.

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Transcripción de la presentación:

Fuerzas Un Repaso

Tarea 1-10

1. Qué es una fueza? Un empujón o jalón

2. Cuales son las 2 partes de cada fuerza? dirección y magnitud dirección y magnitud

3. Qué es fricción? Una fuerza que opone movimiento

4. En cuál dirección empuje fricción? En la dirección opuesto del movimiento En la dirección opuesto del movimiento

5. Si la cantidad de fricción está reducida qué pasará con el movimiento? la rapidez aumenta la rapidez aumenta

6. Si algo no está moviendo, qué tipo de fricción existe? Fricción estática

7. Qué pueden medir para saber la fuerza de flotabilidad exacta? Spring scale or graduated cylinder El peso del agua desplazada

8. Qué es la relación entre densidad y flotabilidad? Objeto menos denso del objeto flota

8/9. Qué es peso? La medida de la fuerza de gravedad a un objecto

9/10. Qué es la diferencia entre masa y peso? Masa es la cantidad de materia algo tiene (# atomos), entonces NUNCA cambia. Peso cambia is la gravedad cambia.

Your Turn!

Flotabilidad es el empuje hacia _______ por los liquidos Principio de arquimedes: la fuerza de flotabilidad es igual al ____________del agua displazado. arriba peso

Buoyant force (text 82-3, 86) Si desplaza 8 N de agua, que es la fuerza de flotabilidad? 8N

El cubo tiene una fueza de gravedad de 10 N. Que es la fuerza de flotabilidad? A: 10 Newtons B: mas de 10 Newtons C: menos de 10 Newtons D: no hay suficiente informacion

Cual fuerza esta en el cemento? Compresion

Cual fuerza esta en las lineas metales ? Tension

Hector tiene una masa de 6 kg y pasa 60 N en la tierra. Que sea su masa si se fue a la luna? 6 kg

Que pasaria a su peso en la luna? A.Queda igual B.aumenta C.disminuye

Net Force Homework 11-16

11. La suma de todas las fuerzas sobre un objeto se llama Fuerza Neta

12. Qué es fuerza neta cuando todas las fuerzas están balanceadas? Equilibrio existe cuando la fuerza neta = 0

13. Qué pasa con el movimiento cuando las fuerzas están balanceadas? El movimineto no cambia cuando las fuerzas están balnceadas El movimineto no cambia cuando las fuerzas están balnceadas

14. Qué es la fuerza neta? 300N 350 N = 650 N

15. Qué es la fuerza neta? 3 N 11 N 6 N 11- (3 + 6) 11- (9) = 2 N

16. Qué hacen fuerzas desequilibradas al moviminto del objeto? El movimento cambia cuando las fuerzas no están balanceadas

16a. What is the same about these forces? 3 N 3 N 3 N 3N 3N 16b. What is different about them? -The are different directions and different forces 16c. Are they balanced? -No because they are not acting on the same object -They have the same magnitude (size)

Your turn!

El carro esta parado y en equilibrio. Que sera su movimiento? Queda en reposo.

The boy is riding his bike at 15 mph and is in equilibrium. What will his speed be? 15 mph If it is moving, it will continue moving, in the same direction and at the same speed.

Que es la fuerza neta? 3 N 11 N 3-11 = 8 N left

Newton’s First Law of Motion Part 1: Un objeto en reposo queda en ___________ hasta que actua una fuerza desquilibrada. reposo

Newton’s First Law of Motion Part 2: Un objeto en movimiento, sigue moviendo a una velocidad constante hasta que actua una fuerza _______ desequilibrada

The more mass an object has the more inertia it has. TrueorFalse

What is Inertia? Inertia is the property of an object that resists changes in motion. Objects with more mass have more inertia and are more resistant to changes in their motion.

Newton’s Second Law HW 17-21

17. Un camión sin personas puede acelerar a m/s/s. Si el conductor usa la misma fuerza, qué pasará a la acceleración is el camión está llena de estudiantes? A = force / mass Si la masa aumenta, la acceleración disminuye

18. Qué es la fuerza necessario para mover una caja con una masa de 50 kg a una acceleración de 2 m/s/s? F=m x a F= (50kg) x (2 m/s/s) =100 N =100 N

19. Cuál objeto require más fuerza para mover, por su masa? 15 kg regalo 5 kg pastel 1 kg gorra 15 kg regalo!

20. Cuales son dos cosas que afecta la acceleración de un objeto? Force causes acceleration, and mass resists acceleration.

21. If you are pushing a shopping cart with groceries what could you do to make it go faster? Add more force (push it harder)

YOUR TURN

Name that law 1. If a driver turns a corner too quickly your body leans sideways 1st

Name that law 2. While going up in an elevator your weight slightly increases 2nd

Name that law 3. Explains the relationship between force, mass and acceleration 2nd

Name that Law 4. A bowling ball knocks down a set of pins and keeps rolling 1st

Name that Law 5. A boy wants to travel faster on his bike so he peddles with more force 2nd

Speed Review

22. How far could Jorge run in 30 minutes at a speed of 5 mi/hr? D = s x t =5 x 0.5 =5 x 0.5 =2.5 mph =2.5 mph

23. What is the speed after 4 seconds? 1.0 m/s

23. How would you describe the speed in the graph? Constant

24. What is the speed of the object in the graph? S = d / t =10 / 10 =10 / 10 = 1 m/s = 1 m/s

25. How far did the object move between 5 and 10 seconds? 5 m

The Force Equation: Force = mass x acceleration Mass = force / acceleration Acceleration = force / mass

Newton’s Second Law of Motion The acceleration of an object depends on the mass of the object and the amount of force applied Part 1: Acceleration depends on mass Part 2: Acceleration depends on force

What happens when the force increases? The stronger the force on an object, the greater its acceleration.

What happens if the mass is increased? There must be more force to keep the same acceleration 5 N 8 N

Name that Law 6. A soldier shoots a rifle and the gun moves back towards his shoulder 3rd

Name that law 4. When you walk, you push on the sidewalk, and the side walk pushes on you with equal force 3rd