What is the cause of the movement

Forces and changes in movement; Types of force their causes and effects

Forces and changes in movement

Formula symbol of force: F.

Unit: [F]= 1 Newton (1 N)

This unit is named after Isaac Newton (1634-1727).

Forces can make a difference

  • a change in the movement of bodies (speed or direction of movement, or both)
  • a change in the shape of bodies
The Effect of a force is dependent on a body

  • of the amount
  • from the direction
  • from the point of attack


A body is in Balance of forceswhen all forces acting on it cancel each other out.


Law of inertia:
The law of inertia will too Newton's first law and was first formulated by Galileo Galilei in 1638.
It states that a body remains at rest or in straight, uniform motion as long as all forces acting on it cancel each other out.

The force acting on a body F. is the product of the crowd m of the body and the acceleration athat he receives through the force.



Types of force, their causes and effects

There are different types of forces due to different causes.

Important types of forces are Weight force, the Frictional force and the electric power.

Weight force Frictional force electric power
effect A body with a mass of 1 kg has a weight of about 10 N on earth Frictional forces always work in such a way that they prevent or inhibit the movement of bodies electrical forces act between charged bodies or particles
root cause The attraction of mass (gravity) between the body and the earth The surface texture of the bodies that touch The electric charge

Two forces can become a Total force be summarized.


hooke's law

This applies to the elastic deformation of bodies, especially the stretching of springs Hooke's law :





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