• To determine the cause of motion of bodies
  • Explanation of gravity
  • Explanation of the force of elasticity

This virtual lab is designed for use in science lessons on the following topic:

  • Grade 5. Chapter II. “Why do bodies move?”

Virtual experiment 

The virtual simulation allows students to model the forces of gravity and elasticity. By playing with one or two mass-spring systems and making the connection between mass, a constant spring, and motion, he conducts a variety of experiments. 

A force is a quantity that describes the effect of bodies on each other.The force of gravity is the force of attraction of bodies to the Earth. The force of elasticity is the force that occurs when a body is deformed, which counteracts that deformation and tends to return the body to its original state.

The figure below shows the functions each button performs.


Step 1. The virtual simulator presents three different sections: stretch, bounce, lab. Select “Stretch”. In the experiment you will work on this section. 

Step 2. Description of the elements of the simulator

  • Two springs: Next to each spring are buttons to set the spring stability. The thickness of the spring is used to indicate its stability.
  • Kettlebells: On the bottom are kettlebells of different weights: 50g, 100g, 250g and unknown kettlebells.
  • Buttons: Buttons are available to view the natural length and balance position of the springs. A ruler is provided to measure the length of the springs.

Step 3. Visualize spring states:

  • Blue dashes denote the length of the spring in the unstretched state.
  • Red dashes indicate a moving line showing the change in length.
  • Green dashes denote the spring’s resting state.

Step 4. Hang the weights on the springs by holding down the left mouse button.

Step 5. Using the ruler, trace the length changes with the dashes to see the natural length and balance position. 

Step 6. Change the thickness of the first spring using the stability set button. How did changing the thickness of the spring affect its length?

Step 7. Change the thickness of the second spring using the stability button.Compare the length of the second spring to the original spring. How did changing the thickness of the spring affect its length?

Step 8. Hang a kettlebell of the same weight on the second spring as on the first spring. Compare the lengths of the springs. What change

Step 9. Conduct various experiments:

  • Replace the garlands on the springs with garlands of a different weight.
  • Change the thickness of the springs.

Step 10. Draw conclusions:

  • How is the length of the springs changed by the weights?
  • How does changing the thickness of the springs affect the length of the springs?


By analyzing the data obtained, it can be concluded that the thickness of the spring has a significant effect on its performance. Increasing the thickness of the spring, as shown by the results, leads to a change in its length and probably an increase in its stability.

It is also revealed that the addition of kettlebells on the springs leads to additional stretching and changes in its characteristics.