Motion Class 9 CBSE Notes - Chapter 8

Flashcards covering key terms and definitions from Chapter 8 on Motion, designed for Class 9 CBSE students.

Reference Point

A fixed point used to describe the position of an object.

Distance

The total length covered by a moving object, has no direction.

Displacement

The shortest distance between two points, has both magnitude and direction.

Magnitude

The size or extent of a physical quantity.

Scalar Quantity

A quantity that has only magnitude, e.g., time, distance.

Vector Quantity

A quantity that has both magnitude and direction, e.g., velocity, force.

Speed

The rate of change of distance, measured in units like km/h.

Average Speed

Total distance travelled divided by total time taken.

Uniform Motion

When an object covers equal distances in equal intervals of time.

Non-Uniform Motion

When an object covers unequal distances in equal intervals of time.

Velocity

The rate of change of displacement, a vector quantity.

Instantaneous Velocity

The velocity of an object at a particular moment in time.

Acceleration

The rate of change of velocity, also a vector quantity.

Distance-Time Graph

A graph showing the change in position of an object with respect to time.

Velocity-Time Graph

A graph showing the change in velocity with respect to time.

Equations of Motion

Three equations used to describe the motion of an object with uniform acceleration.

Uniform Circular Motion

Motion in a circular path at a constant speed.