# data[].attributes.body
In physics, the Net force is the overall force acting on an object. To calculate net force, the body is isolated and interactions with the environment or other constraints are represented as forces and torques in a free-body diagram. ... It is possible for a system offorces to define a torque-free resultant force.
https://en.wikipedia.org/wiki/Net_force

# data[].attributes.body
The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.

https://en.wikipedia.org/wiki/Speed

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Static friction is a force that keeps an object at rest. It must be overcome to start moving the object. Once an object is in motion, it experiences kinetic friction. If a small amount of force is applied to an object, the static friction has an equal magnitude in the opposite direction.
www.softschools.com/formulas/physics/static_friction_formula/30/

# data[].attributes.body
Kinetic friction is a force that acts between moving surfaces. An object that is being moved over a surface will experience a force in the opposite direction as its movement. The magnitude of the force depends on the coefficient of kinetic friction between the two kinds of materia
www.softschools.com/formulas/physics/kinetic_friction_formula/92/

# data[].attributes.body
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.
https://en.wikipedia.org/wiki/Friction