Motion in Straight Line - NEET (XI) Physics

Flashcards cover key concepts, formulas, and definitions related to motion in a straight line and kinematics, suitable for NEET physics preparation.

Position Vector

Describes the position of a point in space relative to an origin, represented as $extbf{r} = x extbf{i} + y extbf{j} + z extbf{k}$.

Displacement Vector

A vector that represents the change in position of an object.

Average Speed

The total distance travelled divided by the total time taken.

Instantaneous Speed

The speed of an object at a specific moment, calculated as ext{lim}_{ riangle t o 0} rac{ riangle s}{ riangle t}.

Average Velocity

The net change in position divided by the time interval, given by ext{Net Displacement} = rac{ ext{final position} - ext{initial position}}{ ext{time interval}}.

Average Acceleration

The change in velocity divided by the time interval.

Instantaneous Acceleration

The acceleration of an object at a specific moment, given by the time derivative of velocity.

Equations of Motion

Describes the relationship among displacement, initial velocity, final velocity, time, and acceleration for constant acceleration.

Stopping Distance (s)

The distance required for an object to come to a complete stop, given initial speed and constant retardation.

Position-Time Graph (x-t)

A graph showing object position over time, with slope representing instantaneous velocity.

Velocity-Time Graph (v-t)

A graph showing velocity over time, where slope represents acceleration and area under curve represents displacement.

Motion Under Gravity

Describes the behavior of freely falling objects, using equations that account for gravitational acceleration.

Relative Velocity

Velocity of one object as observed from another object, expressed as $ext{Relative Velocity of A w.r.t. B} = v_A - v_B$.

Galileo’s Law of Odd Numbers

Describes the distances traveled in successive equal intervals of time by a body accelerating from rest as 1 : 3 : 5 : 7… (i.e., $2n - 1$).