Acceleration is a change in velocity Speed or direction Centripetal Acceleration Acceleration can mean a change in direction not just speed Centripetal acceleration Acceleration that occurs in a circular motion ID: 775814
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Slide1
Acceleration
Slide2Acceleration
Acceleration is a change in velocitySpeed or direction
Slide3Centripetal Acceleration
Acceleration can mean a change in direction, not just speedCentripetal accelerationAcceleration that occurs in a circular motion
Slide4Calculating Acceleration
Acceleration is the rate at which velocity changesCan be positive (speeding up) or negative (slowing down)A = or
Slide5Acceleration Practice
A turtle swimming in a straight line toward the shore has a speed of 0.50 m/s. After 4.0 s, its speed is 0.80 m/s. What is the turtle’s average acceleration?A= = = 0.08 m/s2
Slide6More Practice
Can you rearrange the formula to solve for other variables?Harold’s car accelerates at an average rate of 2.6 m/s2. How long will it take his car to speed up from 24.6 m/s to 26.8 m/s? a= 2.6 m/s2 = = t = = 0.85 seconds
Slide7Practice
A driver starts his parked car and within 5 seconds reaches a speed of 60 km/hr. What is his acceleration?
With an average acceleration of
2
m/s
2
, how long will it take a cyclist starting from rest to reach 10 m/s?
A car traveling at 7.0 m/s accelerates at the rate of
2
m/s
2
for 2.0 s. What is the final velocity of the car?
Slide8Practice Problems
A driver starts his parked car and within
20
seconds reaches a speed of
40 m/s.
What is his acceleration?
With an average acceleration of
1.5
m/s
2
, how long will it take a cyclist starting from rest to reach
15
m/s?
A car traveling at
10
m/s accelerates at the rate of
2.2
m/s
2
for
5
s. What is the final velocity of the car?
Slide9Graphing Accelerated Motion
The slope on a speed vs. time graph is equal to the acceleration.
Slide10Interpreting Motion Graphs
Describe what is happening from points A-D if this is a distance vs. time graph.Describe what is happening from points A-D if this is a velocity vs. time graph.
A
C
B
D
Slide11Velocity and Acceleration Lab
TrialDistance (m)Time (s)Avg. speed (m/s)Avg. acceleration (m/s2)123
For 3 trials:
Copy and complete the above chart
Graph distance vs. time
All three on the same graph
Graph velocity vs. time
All three on the same graph
Slide12Multi-step Problems
A giraffe runs 35 meters in 5 seconds. Then, he comes to a stop in 15 seconds. Calculate his acceleration.
A toy car placed at the top of a 6.0 m ramp is released and rolls down the ramp. The car takes 12.0 seconds to roll down the ramp. What is the final velocity of the car? What is the acceleration of the car?