Topic 3 Newton’s third law of dynamics

“The only way humans have found to move forward is to leave something behind”…( Interstellar_C.Nolan)“

At the end of the film Interstellar Newton’s third law is mentioned, when the robot Tars, at the moment of detaching from the mother-ship to “fall” into the black hole together with the protagonist Cooper, says that “the only way humans have found to move forward, is to leave something behind”

The thrust that the robot and the spaceship give each other will lead to an action reaction that will produce a substantial change for human beings but also for Cooper, the protagonist, who will fall in the black hole.

Newton basically says that when a force is exerted, two bodies are always involved. The action never happens one way, but there is a mutual influence.

Let’s consider, for example, an object placed on a table: the body exerts a certain force on the table, equal and opposite to that which the table exerts on the object to keep it “suspended”, stationary.

This is what happens to the body of any human being when they are in an upright position, and through the pushing force they exert on the floor and which the floor reciprocates, they manage to stand “still”.

“Forces always come in pairs. If object A exerts a force F on object B, then object B will exert an equal and opposite force -F on object A”

Why is it easy to explain these laws through dance?
First of all, because dance involves the human body, which par excellence embodies perhaps all the laws of physics and all the solved and unsolved scientific mysteries.

From an early age, a dancer will find themself applying and defying the laws of gravity, and all Newton’s laws, whether they work alone, in a group or in pairs.

This is possible with the greatest ally and enemy a dancer has: the floor.

While in the life of an ordinary person the relationship with the floor or the ground or any surface they meet is completely casual and unaware, the dancer, from the very first moments of approaching dance, must absolutely take the floor into account and manage it consciously.

The floor is par excellence the object B on which to exert a measured and correct force F to obtain the correct force reaction as object A.

The dancer always has Newton’s third law in mind, because if they get the type of force F wrong as object A on object B they will not get the reaction F they need for the movement they have to achieve.

The dancer always has Newton’s third law in mind, because if they get the type of force F wrong as object A on object B they will not get the reaction F they need for the movement they have to achieve.

The first of these exercises sees the participants in a condition of observers and mimics of the movements that the instructor will perform in front of them.
The group will then be divided into pairs who will do the same exercise, taking turns becoming their partner’s instructors.

This exercise is again performed in pairs and involves the participants moving all parts of their partner’s body and maintaining the positions. Of course, the pair then switches roles.

Each participant in a defined space will be accompanied by the instructor to improvise a given number of positions. The impromptu creation of each participant will highlight the mechanical capabilities of the body that, after the first warm-up phase, can already begin to make our starting point explicit.

PRACTICE VI_Through space

Participants will perform movements along a defined space.

Participants will have to memorize and perform short choreographic actions to develop and put into practice the knowledge they acquired.

Participants will perform in a final performance

I was in you, O movement, outside of all things

Paul Valéry

The Dance and the Soul