- Free falling is a motion under gravitational force as the only force acting on the moving object.
- The acceleration of a free falling object is always constant.
- On the surface of the earth, the acceleration of is equal to 10ms-2, and is named as gravitational acceleration.
- In SPM, you need to know the graphs of free falling of the following movement
- Launching object upward.
- Dropping Object from High Place
- Object Falling and Bounce Back
Launching Object Upward
- When you launch an object upward, its velocity decreases at a constant rate, hence it's a straight line with negative gradient in a velocity-time graph.
- Since the velocity decreases at a constant rate, hence the acceleration is constant. Also, the acceleration is negative because the speed decreases in positive direction. Therefore, the acceleration graph is a horizontal line in the negative domain.
Motion
Velocity-Time Graph
Acceleration-Time Graph
Dropping Object from a High Place
- When an object drops from a high place, its velocity increases at a constant rate, hence it's a straight line with positive gradient in a velocity-time graph.
- Since the velocity increases at a constant rate and the speed increases in positive direction hence the acceleration is constant and positive.
Motion
Velocity-Time Graph
Acceleration-Time Graph
Object Falling and Bounce Back
Motion
Velocity-Time Graph
Acceleration-Time Graph
