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Showcase - Physics

Author: Edu Plexor

Thank you!

We are looking forward to your comments. Visit our website edu.plexor.eu.

Ant

An ant is crawling along the edge of a round cup at a constant speed. Its movement is observed when it crawled half of the way.

You can make singlechoice questions, where you click on the right answer!

(http://demo.edu.plexor.eu/files/112/mravlja.png)

(http://demo.edu.plexor.eu/files/112/graf1.png)

(http://demo.edu.plexor.eu/files/112/graf2.png)

(http://demo.edu.plexor.eu/files/112/graf3.png)

(http://demo.edu.plexor.eu/files/112/graf4.png)

Correct!

Again

Arrange

Properly arrange the labels.

(http://sk.edu.plexor.eu/files/100/oznake3.png)

(http://sk.edu.plexor.eu/files/100/oznake4.png)

(http://sk.edu.plexor.eu/files/100/oznake5.png)

(http://sk.edu.plexor.eu/files/100/oznake6.png)

Reset

$^{5}He$

$^{3}T$

$^{5}Li$

$^{2}D$

Check

Matching can also be made with images.

Correct.

	$^{5}He$
	$^{3}T$
	$^{5}Li$
	$^{2}D$

Again

Alpha particle

Figure shows an alpha particle. Alpha particle is a helium nucleus.

How many protons has an alpha particle? How many neutrons has an alpha particle?

Check

(http://sk.edu.plexor.eu/files/100/alfa.png)

You can make questions with numerical answers, where the user writes the right anwser in the box provided.

Correct!

Again

Shape of the jet

A water jet maintains a constant the flow rate. Select the equation that describes the conservation of the flow rate. Points 1 and 2 are marked on the image.

$S_1 v_1 = S_2 v_2$

$p_1 V_1 = p_2 V_2$

$\rho g h_1 = \rho g h_2$

$v_1 = v_2$

(http://sk.edu.plexor.eu/files/100/pipa1.png)

The answer is correct!

$\Phi = \frac{\Delta V}{\Delta t}$

.

Again

Again, you did not answer correctly.

We know: $v_1 S_1 = v_2 S_2$ . Connection $\Phi = S v$ can be derived from the definition of the flow

$\Phi = \frac{\Delta V}{\Delta t}=\frac{S \Delta s}{\Delta t}=S v.$

Calculate the speed of the car. In calculating the acceleration, take g to be $9,81$ m/s $^2$ .

(http://sk.edu.plexor.eu/files/100/odg.png)

$F_c = \frac{mv^2}{r}$
$F_c = mg \tan \varphi$

$v_1 =$ m/s

Hitrost izračunamo tako, da zapišemo $2.$ Newtonov zakon za kroženje.
$F = ma_r$
$mg \tan \varphi = m \frac{v^2}{r}$
$v = \sqrt{rg} \tan \varphi$

Check

Radius

Angle

You can add images to make the exercise clearer.

You must answer the question.

Again

Radius: $r=$ m.

Angle: $\varphi =$ $^o$ .

Red circle

Watch the red circle from beginning to end movement. Which statement about the cycle is correct?

The movement from the initial position is

(http://sk.edu.plexor.eu/files/100/premik_2_4_m1.gif)

-3

-1

3

4

5

7

The answer is correct. The initial position is $2$ and the final is $-1$ .

Again

The initial position is $2$ and the final is $-1$ . Move the circle is $-3$ .

Take a good look at the circuit in the photo. Predict how the lamps A, B and C will light, after connecting the upper left crocodile at the free connector of the left battery. The resistance of the wires is negligible.

(http://sk.edu.plexor.eu/files/100/vezjaABCD1.png)

Select from the following numbers in the table:
$2$ -bulb is strongly lit,
$1$ -bulb is weakly lit,
$0$ -bulb is not lit.

A	0 1 2
B	0 1 2
C	0 1 2
D	0 1 2

Check

Another option for the questions are the ones, where the possible answers are given in a drop-down menu.

The answer is correct.

The circuit is a sequence binding bulbs A and B, and the circuit in which C and D are bound in parallel. Therefore, through the A and B running full flow through C and D through only half the flow that is driven by batteries.

(http://sk.edu.plexor.eu/files/100/lucke1.png)

The image below shows a submerged ball of oak wood. Images are marked with A, B and C.

Link each image with the appropriate name of the liquid.

A		B		C

A

B

C

Reset

WATER

LINSEED OIL

GLYCERIN

Check

Table densities

Well done!

Again

Table densities

1. Solids

2. Fluid

a) Liquid

b) Gases

substance	density $[\frac{kg}{dm^3}]$
cobalt	$8.60$
glass	$3.00$
limestone	$2.60$
oak wood	$0.90$
pine wood	$0.50$
cork	$0.25$

substance	density $[\frac{kg}{dm^3}]$
glycerin	$1.26$
water	$1.00$
linseed oil	$0.92$
benzol	$0.88$
naphtha	$0.80$
gasoline	$0.71$

substance	density $[\frac{kg}{dm^3}]$
air	$1.29*10^{-3}$
ammonia	$0.77*10^{-3}$
helium	$0.17*10^{-3}$

Close

Car making a turn

Using tools over the images you can create many dynamical exercises.

We make a turn with a car, as shown in the image. With the help of the tools on the image, measure the radius of the loop.

$R =$ m

While searching for the radius of the loop it is cruical to understand, that the loop is just a part of the circumference.

We expect some users to have issues with determining where is the radius of the circumference. Therefore we should help ourselves with the image of the circumference wirh the radius drawn in it. We take radius with values between 42 and 52 as correct.

Photo shows a pendant in a car during driving in the right corner. From the picture define angle, for which is the pendant away from the vertical.

Inclined pendant in the car in the right corner

$\phi =$ $^{o}$

We take for correct the angles between $19$ ^o and $23$ ^o.

Again

Result of the measurement is incorrect. The correct answer is $21^{o}$ $\pm 2^{o}$ .

Which constellation will ride exactly in the East on 5th of December at $19.00$ ?

Check

With star map you can cover many topics in astronomy.

Excellent, you are doing very well.

Again

On 5th of December at 19:00, exactly in the East, there will be rise of the Orion constellation.

Showcase - Physics

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Showcase - Physics

Author: Edu Plexor

Thank you!

We are looking forward to your comments. Visit our website edu.plexor.eu.

Table densities