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Acceleration. Section 2.2. Standards Covered. PS – 5.3 Explain how changes in velocity and time affect the acceleration of an object PS – 5.4 Use the formula a = (v f -v i )/t to determine the acceleration of an object. Acceleration. Acceleration – rate of change of velocity

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acceleration

Acceleration

Section 2.2

standards covered
Standards Covered
  • PS – 5.3 Explain how changes in velocity and time affect the acceleration of an object
  • PS – 5.4 Use the formula a = (vf-vi)/t to determine the acceleration of an object
acceleration3
Acceleration
  • Acceleration – rate of change of velocity
    • Object changes its speed, direction, or both
  • Positive acceleration – object is speeding up
  • Negative acceleration – object is slowing down
calculating acceleration
Calculating Acceleration
  • Acceleration = change in velocity

time

= vfinal – vinitial = vf – vi

time t

  • Units = m/s – m/s = m/s2

s

example 1
Example #1
  • Suppose a jet airliner starts at rest at the end of runway and reaches a speed of 80 m/s in 20 s. What is its acceleration?

a= vf – vi

t

= 80 – 0

20

= 4 m/s2

example 2
Example #2
  • A skateboarder is moving at a speed of 3 m/s and comes to a stop in 2s. Calculate the acceleration of the skateboarder.

a= vf – vi

t

= 0 – 3

2

= -1.5 m/s2

your turn
Your Turn!!
  • A car accelerates from a standstill to 60 km/s in 10.0 seconds. What is its acceleration?
  • A car accelerates from 25 km/s to 55 km/s in 30 seconds. What is its acceleration?
  • A runner achieves a velocity of 11.1 m/s, 9 seconds after he begins. What is his acceleration?
graphing acceleration
Graphing Acceleration
  • Velocity goes on the y-axis
  • Time goes on the x-axis
  • Slope = rise(y) = velocity = acceleration

run(x) time

  • Upward slope – (+) acceleration – speeding up
  • Downward slope – (-) acceleration – slowing

down

  • Flat line – 0 acceleration – constant speed