#physics #science #describingmotion #acceleration #deceleration

Ch:- 2

Pg:- 30,31,32,3

-Acceleration is the rate at which an object’s velocity changes with time. It measures how quickly an object speeds up, slows down, or changes direction.

Acceleration = change in velocity/ change in time.

Types of Acceleration:

1. Constant Acceleration: The acceleration is uniform; examples include free fall under gravity (ignoring air resistance).

2. Variable Acceleration: The acceleration changes over time; examples include a car accelerating unevenly due to changing forces.

3. Centripetal Acceleration: This occurs in circular motion and points towards the center of the circular path, altering the direction rather than the speed.

-Deceleration is a specific type of acceleration where the velocity of an object decreases over time. It's commonly referred to as negative acceleration because it acts in the opposite direction of the object's motion.

Mathematical Expression: The same formula applies, but the acceleration value will be negative if the object is slowing down.

Key Differences

1. Direction of Change:

   • Acceleration increases velocity (positive direction).

   • Deceleration decreases velocity (negative direction).

2. Physical Intuition:

   • Acceleration occurs when an object speeds up, like a car moving faster when you press the gas pedal.

   • Deceleration happens when an object slows down, like braking a car.