Force is any interaction that, when unopposed, will change the motion of an object.
Force have both magnitude(ukubwa) and direction
The Necessity of Force:
- to move a stationary object i.e. to move a body which is at rest.
- to change the direction of the motion of an object.
- to change the magnitude of the velocity (speed) of the motion of an object.
- To change the shape of an object
Beam balance measures the mass of the body while a spring balance measures the weight of the body taken into consideration.
Mass vs Weight
Non Fundamental Forces is every force that can be derived from other forces.
An example: the elastic force of a spring.
It is very convenient to express it as a force in problems of mechanics, but in reality this force is due to the electric bounds within the material of the spring. So the elastic force is a combination of many electromagnetic interactions and it is not a fundamental force.
Fundamental force ( Fundamental interaction) any of the four forces in nature that are responsible for the way that matter behaves: electromagnetic force, gravity, strong force, and weak force
Why freely falling body in air moves
An object that is moving only because of the action of gravity is said to be free falling and its motion is described by Newton's second law of motion. ... The acceleration is constant and equal to the gravitational acceleration g which is 9.8 meters per square second at sea level on the Earth.
Force Of Gravity
is the universal force of attraction acting between all matter.
Some examples of the force of gravity include: The force that holds the gases in the sun. The force that causes a ball you throw in the air to come down again. ... The force that causes a glass you drop to fall to the floor.
Resultant Forces(Net Force)
is equal to the sum of all forces applied on object
normal force is the force that surfaces exert(jitahidi) to prevent solid objects from passing through each other.
Tension force is defined as the force that is transmitted through a rope, string or wire when pulled by forces acting from opposite sides.
air resistance is forces that are in opposition to the relative motion of an object as it passes through the air.
Magnetic Force is a force that attracts certain metal objects (like iron and iron filings) towards a magnet.
Electrostatic force (Coulomb force or Coulomb interaction)
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