Se muestran los artículos pertenecientes a Marzo de 2017.

## 4ESO Física i Química : ARTICLE 118 : FREE FALL MOTION exercises.

Publicado: 01/03/2017 02:50 por easyfisquim en 4ESO FiQ 2016-2017 ENGLISH (from article 47).

-  Watch the following video and later we will do a similar exercise all together :

-  Watch the previous video and the next ones you find below and try to do the following two exercises at home :  (you still have the videos with the solution in case you don’t know how to finish them).

1-    Problem 1 :

a) A child throws just upright to the sky a little stone with a starting velocity of 6 m/s.  Find the time the Stone takes to reach the higher position.

b) After that, work out the distance this stone goes over when it finally hits the ground at the end of its movement. How long does the Stone take to arrive again to the ground from its higher position on the top?.

c) Work out the total displacement the stone does from the beginning to the end of its movement and the total time of this movement from the beginning to the end.

2- Problem 2 :

From the top of a skyscraper a stone is thrown in a straight line motion to the ground with a starting velocity of 2 m/s. if the stone takes 5 seconds to hit the ground, work out how high the skyscraper is.

(There is a mistake at the video because , as the Stone goes down some direction to gravity,  the starting velocity must have same sign as gravity, if I write minus sing for gravity I must write also minus sign for starting velocity.
I should have written  - v0  instead of + v0 for the starting velocity.
So It must be written  :       0 = h - v0.t - 1/2.g.t2     ).

Then the skyscraper’s high is :  h = 10 + 122’5 = 132’5 m

Once you have tried to do these exercises and watched the videos, will you do a few more similar exercises next Friday in class. Then it is important you do at home the suggested activities on this article 118.

DON’T FORGET TO DO THIS AT HOME!!!

- Now that you have watched all these videos and last friday you have also tried a few more similar exercises in class, try now a few more ones like that at home as homework :

Do exercises 43, 27, 58 and 59 from your book and have them ready on Monday.

## 4ESO Física i Química : ARTICLE 119 : UNIFORM CIRCULAR MOTION.

Publicado: 04/03/2017 06:25 por easyfisquim en 4ESO FiQ 2016-2017 ENGLISH (from article 47).

-  Let's look the following link up in order to learn about circular motion :

## 4ESO Física i Química : ARTICLE 120 : Free fall complexer exercise.

Publicado: 04/03/2017 08:48 por easyfisquim en 4ESO FiQ 2016-2017 ENGLISH (from article 47).

- Try to do this exercise. If you cannot achieve it, watch the video and look at and listen to the explanation, but try first doing it without watching the video :

> Exercise :

A Stone is thrown from the top of a building with an initial velocity of 20m/s straight upward. The building is 50m high, and the Stone just misses the edge of the roof on its way down. Determine :

a) The time needed for the Stone to reach its máximum height.
b) The máximum height.
c) The time needed for the Stone to return to the level of the thrower.
d) The velocity of the Stone at this instant.
e) The velocity and position of the Stone at time = 5 secons.

## 1ESO Tecno : ARTICLE 13 : Les Escales.

Publicado: 07/03/2017 00:28 por easyfisquim en 1ESO Tecnologia Grups D i E , 2016-2017

>    Fes click al següent enllaç, llegeix i fes els exercicis resolts :

## 4ESO Física i Química : ARTICLE 121 : CIRCULAR MOTION EXPERIENCE, LINEAR AND ANGULAR VELOCITY.

Publicado: 08/03/2017 15:27 por easyfisquim en 4ESO FiQ 2016-2017 ENGLISH (from article 47).

- This is a little drawing about the practice we have done of the uniform circular motion with our skates using a spinning movement at the playground.
On friday we’ll check the times and data we have taken and will work out angular velocity and will talk about all of this.

## 4ESO Física i Química : ARTICLE 122 : UNIFORM CIRCULAR MOTION PRACTICE.

Publicado: 09/03/2017 08:23 por easyfisquim en 4ESO FiQ 2016-2017 ENGLISH (from article 47).

- At this article will be hung pictures and video about uniform circular motion practice we did yesterday using the skates :

## 4ESO Física i Química : ARTICLE 123 : Forces and dynamics.

Publicado: 22/03/2017 10:29 por easyfisquim en 4ESO FiQ 2016-2017 ENGLISH (from article 47).

- Check the following link to begin the next lesson about how forces act :

## 4ESO Física i Química : ARTICLE 124 : Forces lesson exam exemple 1.

Publicado: 23/03/2017 08:21 por easyfisquim en 4ESO FiQ 2016-2017 ENGLISH (from article 47).

MAY THE FORCE BE WITH YOU !!!

- We’re gonna check first a nice exam example about this lesson and you’ll see how easy is handle or deal with this kind of exercises. You only have to put up with me or bearing me for a while :

(THIS EXERCISES HAVE BEEN TAKEN FROM THE OTHER PHYSICS TEACHER "ISABEL DE LLANÇA" AND HAVE BEEN VERY WELL PREPARED ).

- You can follow a nice explanation video about NON CONCURRENT PARALLEL FORCES separated certain distance :

-  After you’ve practiced and watched the different videos, try to do the following exercise by your own. Check previous videos as many times as you need to develope the exercise by yourself. In case you cannot achieve the problem’s solution you have the problem explained at the video below :

> Exercise :

A 15kg metal bar 6m long has two objects hanged at the opposite ends of the bar. At the left end of the bar hangs an 20kg object and at the right end of the bar the second 30kg object. Find where exactly the net force must be placed in order not to let the system fall. Work out the value of the net or balance force, the exact spot it must be placed, the direction and its sense.

## 4ESO Física i Química : ARTICLE 125 : Forces significance. Different kind of forces.

Publicado: 27/03/2017 00:44 por easyfisquim en 4ESO FiQ 2016-2017 ENGLISH (from article 47).

- Watch the following videos about so many different kind of forces we can check :

> LEVITRON.