Physics Definitions

Question 1

Vector

Answer 1

Physical quantity
Has magnitude
And direction

Question 2

Scalar

Answer 2

Physical quantity

Magnitude only

Question 3

Resultant vector

Answer 3

Single vector

Sane effect as original vectors acting together

Question 4

Distance

Answer 4

Length of path travelled

Scalar

Question 5

Speed

Answer 5

Rate of change of distance

Scalar

Question 6

Displacement

Answer 6

Change in position

Question 7

Velocity

Answer 7

Rate of change of displacement

Vector

Question 8

Acceleration

Answer 8

Rate of change of velocity

Vector

Question 9

Work done on an obj by force

Answer 9

Product of displacement and component of force parallel to displacement
W=FXcos

Question 10

Gravitational potential energy

Answer 10

Energy obj possess due to its position

Relative to a reference point

Question 11

Kinetic energy

Answer 11

Energy obj has

Due to its motion

Question 12

Mechanical energy

Answer 12

Sum of
Gravitational potential energy
Kinetic energy
At a point

Question 13

Law of conservation of energy

Answer 13

Total energy in a system cant be created or destroyed

Only transformed

Question 14

Principle of conservation of mechanical energy

Answer 14

M.E of obj is constant

In absence of external forces

Question 15

Net force

Answer 15

Work dont by NF is equal to the change in kinetic energy of obj
W=Fnet.s=EK

Question 16

Potential difference

Answer 16

Work done per unit positive charge

Question 17

Current

Answer 17

Rate of flow of charge

Question 18

Ohms law

Answer 18

Current through a conductor is directly proportional to potential difference across the conduct
If it is at a constant temperature

Question 19

Resistance

Answer 19

Materials opposition to flow of electric current

Question 20

EMF

Answer 20

Total energy supplied per coulomb of charge by the cell

Question 21

Transverse wave

Answer 21

Vibrating source moves in a direction perpendicular to the propagation of the wave

Question 22

Amplitude

Answer 22

Maximum displacement of particles

From rest position

Question 23

In phase

Answer 23

Move simultaneously in same direction and same speed as one another

Question 24

Wavelength

Answer 24

Distance between two consecutive points

In phase

Question 25

Period

Answer 25

Time taken for one complete wave to pass a point

Question 26

Frequency

Answer 26

Number of complete waves that pass a point in one second

Question 27

Electromagnetic waves produced

Answer 27

Accelerating charge form changing electric and magnetic fields and propagates at 90