KINEMATICS-ACCELERATION
ACCELERATION
Acceleration is defined as the rate of change of velocity with respect to time.Acceleration is a vector quantity as it has both magnitude as well as direction. When the velocity of an object changes it is said to be accelerating. Basically, acceleration is the word which is often used to describe a state of increasing speed.
For cheetah, before starting of its running, its starting velocity is zero & once its starting velocity is ready to change then cheetah will get acceleration to move forward.
Any change in the velocity of an object results in an acceleration: increasing speed, decreasing speed and changing direction.A change in the direction of motion results in an acceleration even if the moving object neither sped up nor slowed down. That’s because acceleration depends on the change in velocity.
Acceleration (a) = \(change in velocity \over time\) =\({v_f-v_i\over t}\)
Vi = initial velocity, Vf= Final velocity, t= time
Example 1:
If a body stated moving with initial velocity 5 m/s and travelled 10 s and stopped at some point with final velocity of 35 m/s. then what is acceleration?
Solution:
Initial velocity = 5 m/s
Final velocity = 35 m/s
Time = 10 s
Acceleration (a) = 3 m/s2