Motion in One Dimension Physics

General Knowledge » Science »


Motion in One Dimension Physics : : Equations of Motion Under Gravity

Mechanics can be divided into 2 Parts :

(A) Statics :

  • Which deals with the study of stationary objects.

(B) Dynamics :

  • Which deals with the study of moving objects.

Terms Regarding Motion

Displacement :

  • The change in position of the body in a certain direction is known as displacement. It is a vector quantity.

Distance :

  • The total path transversed by the body between initial and final states is called distance. It is a scalar quantity.
  • Displacement may be positive, negative or zero but distance is always positive.

Velocity :
General Studies Question Bank CD

  • Time rate of change of displacement is called velocity.
Velocity ( v ) = Displacement ( x ) / Time ( t )
  • It is a vector quantity and may be positive or negative.
Average Velocity = Total Displacement / Total Time
  • Average velocity is zero, if the body returns to starting point in the given time interval.
  • If the body covers first half distance with velocity V1 and next half with velocity V2, then
Average Velocity = 2 V1*V2 / V1+V2
  • If a body travels with uniform velocity V1 for time t1 and with uniform velocity V2 for time t2, then
Average Velocity = V1t1 + V2t2 / t1+t2

Speed :

  • It is a scalar form of velocity and is defined as the distance traveled in 1s.
  • If the body covers a distance d in time t, then
v = d / t ( or ) Average Speed = Total Distance / Total Time
  • If the body covers first half distance with speed u and next half with speed v, then
Average Speed = 2uv / u+v

Acceleration :

  • Time rate of change of velocity is known as acceleration.
  • It is a vector quantity. If Δ v is the change in velocity in time Δt, then
α = Δ v / Δ t
  • Negative acceleration is known as retardation. It indicates that the velocity of the object is decreasing with respect to time.
  • Acceleration is uniform when neither its direction nor magnitude changes with respect to time.
General Studies Question Bank CD

JEE Main

Application Form Submission 16 Dec 2020 to 16 Jan 2021.