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