Definition, Terms And Laws Physic

Question 1

Physical quantity

Answer 1

A quantity that can be measured

Question 2

Base quantities

Answer 2

A physical quantity that cannot be derived from another physical quantity

Question 3

Derived quantity

Answer 3

A quantity which can be obtained by combination of base quantities by mean of multiplication, division or both

Question 4

Scalar quantity

Answer 4

Physical quantity that have magnitude only

Question 5

Vector quantity

Answer 5

Physical quantity that have both magnitude and direction

Question 6

Linear motion

Answer 6

Motion in a straight line

Question 7

Speed,v

Answer 7

Rate of change of distance

Question 8

Acceleration,a

Answer 8

Rate of change of velocity

Question 9

Free fall motion

Answer 9

A situation where an object falls down due to gravitational force only.

Question 10

Inertia

Answer 10

Tendency of an object to remain at rest or to continue it’s uniform motion in a straight line at uniform velocity

Question 11

Newton’s first law of motion

Answer 11

An object will remain at rest or move at uniform velocity unless acted upon by an external force

Question 12

Momentum

Answer 12

A product of mass multiplies by velocity

Question 13

Force,F

Answer 13

The action of pushing or pulling to change the size and direction of motion of an object

Question 14

Newton’s second law of motion

Answer 14

Rate of change of momentum is directly propotional to the force and acts in the direction of the applied force

Question 15

Impulse,J

Answer 15

Change of momentum

Question 16

Impulsive force, F

Answer 16

Rate of change of momentum in a collision or impact in a short period of time

Question 17

Newton’s third law of motion

Answer 17

For every action there is a reaction of equal magnitude but in the opposite direction

Question 18

Weight,W

Answer 18

A gravitational force acting on an object

Question 19

Newton’s universal law of gravitation

Answer 19

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

Question 20

Centripetal force

Answer 20

A force act on the body in a direction towards the center of the circle

Question 21

Kepler’s first law

Answer 21

All planet move in elliptical orbit with the sun at one focus (law of orbit)

Question 22

Kepler’s second law

Answer 22

A line that connect a planet to the sun sweeps out the equal areas in equal time (law of area)