Motion and Forces Unit Chapter 1 Section 3

Acceleration

Describes the change of velocity over time A rate Is a vector Has size and direction Refers to any change in velocity No acceleration if no change in velocity

Acceleration in the same direction as the motion (positive acceleration) Acceleration in the opposite direction as the motion (negative acceleration) Acceleration at a right angle to the motion (acceleration in direction)

Acceleration in the same direction as motion (positive acceleration) Acceleration in the opposite direction as motion (negative acceleration) Acceleration at a right angle to the motion (acceleration in direction) Speed of the object increases Speed of the object decreases Direction of the object changes but the speed remains the same

 The change in velocity  The time it took for the velocity to change

 Formula is: Final velocity – Initial Velocity  Time  Units of measure for each value are: Final velocity and initial velocity: meters/second Time: seconds Acceleration: meters/second 2, which means (meters/second/second)

 Formula is: Final velocity – Initial Velocity  Time  3 m/s – 1 m/s 4 s  2m/s /4s = 0.5 m/s/s or 0.5 m/s 2

 Acceleration is 4m/s 2, which means it increased it’s velocity 4m/s every second.  After 2 seconds, it would be 4 m/s x 2 seconds = 8m/s 2.  It’s initial velocity was 30 m/s.  It increased it’s velocity by 8 m/s in 2 seconds so it’s final velocity is:  30 m/s + 8m/s = 38 m/s