Acceleration is the rate of change of an object's velocity over time. It is a measure of how quickly an object's speed is changing.
Acceleration is calculated by dividing the change in velocity by the change in time. The formula is acceleration = (final velocity - initial velocity) / time. The unit of acceleration is meters per second squared (m/s²).
Acceleration is a general term that describes any change in an object's velocity, while free fall acceleration specifically refers to the acceleration of an object falling under the influence of gravity. In free fall, the acceleration is constant and equal to 9.8 m/s².
No, acceleration can vary depending on the circumstances. For example, an object rolling down a ramp will have a different acceleration than an object falling freely under gravity. However, in the absence of other forces, all objects experience a constant acceleration of 9.8 m/s² due to gravity.
Some examples of acceleration include a car speeding up or slowing down, a rollercoaster going over a loop, and a rocket launching into space. Free fall acceleration can be observed when objects such as a ball or a feather are dropped from a height and fall towards the ground due to the force of gravity.