PHYSICS DEFINITION:
Linear momentum: Linear momentum of a body is the
product of its mass and velocity.
Conservation of Momentum: Sum or total momentum of
the bodies in a closed system is constant provided no resultant external force
acts.
Newton’s First Law of Motion: Object remains at rest
or travels at constant velocity unless it is acted on by a resultant force.
Newton’s Second Law of Motion: Resultant force on a
body is proportional (or equal) to the rate of change of momentum of the body.
Newton’s Third Law of Motion: When body A produces a
force on body B then body B produces an equal and opposite force on body A.
PHYSICS KEYWORD LIST:
Closed system: System of interacting objects in which
there are no external forces.
Perfectly Elastic (collision): Perfectly elastic
collision, the total kinetic energy of all the bodies remains constant.
Inelastic (collision): Inelastic collision, kinetic
energy is not conserved; some is transferred to other forms such as heat.
PHYSICS CHAPTER WISE SUMMARY:
Linear momentum is the product of mass and velocity. (p =
mv)
The principle of conservation of momentum: For a closed
system, the total momentum before an interaction equals the total momentum
after the interaction.
In all interactions or collisions, momentum and total energy
are conserved.
Kinetic energy is conserved in a perfectly elastic
collision; relative speed is unchanged in a perfectly elastic collision.
In an elastic collision, kinetic energy is not conserved. It
is transferred into other forms of energy (such as heat or sound). Most
collisions are inelastic.
Newton’s first law of motion: An object will remain at rest
or keep travelling at constant velocity unless it is acted on by a resultant
force.
Newton’s second law of motion: The resultant force acting on
a body equals the rate of change of its momentum: Resultant force = rate
of change of momentum.
Newton’s third law of motion: When 2 bodies interact, the
forces they exert on each other are equal and opposite.
PHYSICS IMPORTANT NOTES:
Momentum = mass x velocity (p = mv)
Resultant force = Rate of change of momentum. (F = p/t = ma)
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