Acceleration

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Acceleration - PowerPoint PPT Presentation

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

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 = (vf-vi)/t to determine the acceleration of an object
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
• Acceleration = change in velocity

time

= vfinal – vinitial = vf – vi

time t

• Units = m/s – m/s = m/s2

s

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
• 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

• 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
• 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