Some Key Pionts Of Chapter Motion

_1 ➜ Newton first law is called law of inertia._

_2 ➔ The distance in particular direction is called D͟i͟s͟p͟l͟a͟c͟e͟m͟e͟n͟t͟._

_3  ➜ Magnitude of displacement is distance._

_4 ➔ Rate of change of displacement is called V͟e͟l͟o͟c͟i͟t͟y͟._

_5 ➜ Velocity is vector quantity._

_6 ➔  Magnitude of velocity is S͟p͟e͟e͟d͟._

_7 ➜ Newton second law is also called  L͟a͟w͟ O͟f͟ a͟c͟c͟e͟l͟a͟r͟a͟t͟i͟o͟n͟_.

_8 ➜ Bodies fallng freely under the action of gravity provide good example of uniform acceleration._

_9 ➜ The value of g is mass independent._

_10  ➔ Newton dyne and pound are units of force._

_11 ➔ The value of g is zero at the center of earth._

_12 ➔ If the object moves downword the value of g is positive and vice versa._

_13  ➔ The value of g is greater at pole than equator._

_14 ➔ The velocity of short interval of time  or the velocity in which time approach to zero is called instantaneous velocity._

_15 ➔ If an object which covered equal displacement  in equal interval of time is called uniform velocity_

_16 ➔ The unit of speed and velocity is m/sec._

_17 ➔ The unit of acceleration retardation and declaration is m/s2._

_18 ➔ The product of mass and velocity is called M̠O̠M̠E̠N̠T̠U̠M̠._

_19 ➔ Momentum is vector quantity and its S.I unit is NS._

_20 ➔ The direction of momentum is the direction of velocity._

_21  ➔ Rate of change of momentum is called force._

_22 ➜ If the velocity decreases than acceleration is negative and vice versa._

_23 ➔ The resistance in the motion of body os called FͦRͦIͦCͦTͦIͦOͦNͦ._

_24  ➔ Friction is self adjusting force._

_25 ➔ Rolling friction is always less then sliding friction._

_26 ➔ The friction is force which is measured in N._

_27 ➔ To every action there is equal and opposite reaction Newton third law of motion._

_28 ➔ If the force acting on body is double then acceleration produced double._

_29 ➔ The force acting along the string is called tension in string._