Definition, Terms And Laws Physic Flashcards
Physical quantity
A quantity that can be measured
Base quantities
A physical quantity that cannot be derived from another physical quantity
Derived quantity
A quantity which can be obtained by combination of base quantities by mean of multiplication, division or both
Scalar quantity
Physical quantity that have magnitude only
Vector quantity
Physical quantity that have both magnitude and direction
Linear motion
Motion in a straight line
Speed,v
Rate of change of distance
Acceleration,a
Rate of change of velocity
Free fall motion
A situation where an object falls down due to gravitational force only.
Inertia
Tendency of an object to remain at rest or to continue it’s uniform motion in a straight line at uniform velocity
Newton’s first law of motion
An object will remain at rest or move at uniform velocity unless acted upon by an external force
Momentum
A product of mass multiplies by velocity
Force,F
The action of pushing or pulling to change the size and direction of motion of an object
Newton’s second law of motion
Rate of change of momentum is directly propotional to the force and acts in the direction of the applied force
Impulse,J
Change of momentum
Impulsive force, F
Rate of change of momentum in a collision or impact in a short period of time
Newton’s third law of motion
For every action there is a reaction of equal magnitude but in the opposite direction
Weight,W
A gravitational force acting on an object
Newton’s universal law of gravitation
The gravitational force between two bodies is directly propotional to the product of the masses of both bodies and inversely propotional to the square of the distance between the centers of the two bodies
Centripetal force
A force act on the body in a direction towards the center of the circle
Kepler’s first law
All planet move in elliptical orbit with the sun at one focus (law of orbit)
Kepler’s second law
A line that connect a planet to the sun sweeps out the equal areas in equal time (law of area)
