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What is force?
FORCE is a push or pull in a particular direction.FORCE is a vectorial magnitude and is represented by a vector.
The unit of FORCE in the International System of Units is...
the newton (N)
Push
The force that moves something away from you.
Pull
The force that moves something towards you.
Effects of forces
Start the motion,change velocity,stop the motion,change direction,change chape.
Rigid
They aren't deformed when a force is applied.
Elastic
They are deformed when a force is applied,but they return to their original shape when that force is removed.
Plastic:
They are deformed when a force is applied and don't recover their original shape when that force is removed;they stay permanently deformed.
What are contact forces?Examples
They are interactions between objects that touch:applied force,spring force,drag force,frictional force,normal force.
What are non-contact forces?Examples.
They attract or repel,even from a distance:magnetic force,electric force and gravitational force.
What is the weight?
It's the force with which a planet attracts bodies.The direction is always vertical and its sense is downwards, toward the center of the planet.
What is mass?
Mass is the amount of matter in a body.It is a property of the body and it stays the same wherever it is.
Characteristics of mass.
It is a basic unit.It is invariable;it doesn't change with the place in the Universe where the body is found.Its unit in the SI is the kg.It's measured using sc
Characteristics of weight:
It's a derived unit.It's variable;it depends on the gravity in the place where it is measured.Its unit in the SI is the newton.It's measured using a dynamometer
What is the tension?
Tension is the force exerted by a cable or rope when a body hangs from it or pulls on it.
What is normal force?
Normal force si the force that a surface exerts on bodies that are placed on top of it.
