Drop a ball from a rooftop. It doesn't fall at a constant speed — it speeds up every second. This continuous speeding up is caused by Earth's gravity, and the rate at which it speeds up is a fundamental constant called the Acceleration of Free Fall.
On the Moon, the acceleration of free fall is only 1.6 m/s² — about 1/6th of Earth's — which is why astronauts bounce slowly and can jump very high!
The Acceleration of Free Fall (also called Acceleration due to Gravity, denoted g) is the constant acceleration experienced by any object falling freely under the influence of Earth's gravity alone, with no other forces acting on it (no air resistance).
Value: g = 9.8 m/s² (approximately 10 m/s² for quick calculations)
Every single second an object is in free fall, its downward speed increases by 9.8 meters per second.
Using kinematic equations with a = g = 9.8 m/s² and initial velocity u = 0:
**No!** Galileo proved that in the absence of air resistance, all objects fall with the same acceleration (g = 9.8 m/s²) regardless of their mass. A feather and a hammer dropped in a vacuum hit the ground simultaneously.
Absolute Temperature — Definition and Kelvin Scale
Learn the definition of absolute temperature. Understand absolute zero, the Kelvin scale, and how it relates to molecular kinetic energy in physics.
A Cabin is Moved Up the Inclined Plane — Work, Force, and Energy
When a cabin is moved up an inclined plane, the force required is mg sinθ + friction force, and work done equals force × displacement along the incline.
Dimensional Formula of Acceleration
Learn the dimensional formula of acceleration [M0 L1 T-2]. Understand how to derive it using velocity and time.
Acceleration Due to Gravity Formula (g)
Learn the formula for acceleration due to gravity (g = GM/R²). Understand the difference between small 'g' and capital 'G', and its value on Earth.
Distinguish Between Accuracy and Precision
Learn the critical difference between accuracy and precision in physics and data measurement. Understand using the dartboard analogy.
Turn this guide into revision flashcards, a practice exam, or an AI-generated podcast — free, no signup required.