Acceleration. Acceleration The rate at which velocity changes *** velocity is a combination of speed...
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Transcript of Acceleration. Acceleration The rate at which velocity changes *** velocity is a combination of speed...
![Page 1: Acceleration. Acceleration The rate at which velocity changes *** velocity is a combination of speed and direction. Acceleration can be change in speed,](https://reader036.fdocuments.net/reader036/viewer/2022062301/56649f335503460f94c50364/html5/thumbnails/1.jpg)
Acceleration
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AccelerationThe rate at which velocity changes*** velocity is a combination of speed and
direction.Acceleration can be change in speed,
change in direction, or changes in both.Acceleration is a vector ***vector is a number that has magnitude
and direction
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Change in SpeedThis change may be due to either an
increase or a decrease in speed Positive: increasing change in speedNegative: decreasing change in speed
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Free FallMovement of an object
toward Earth solely because of gravity
Due to change in speed
Rate of change in speed is 9.8 meters per second per second (9.8 m/s2)
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Changes in DirectionAcceleration may be due
to its direction constantly changing even though it is traveling at constant speed
Ex: horse on a carousel A horse on the carousel is
traveling at a constant speed, but it is accelerating because its direction is constantly changing.
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Changes in Speed and DirectionSometimes motion is changing in both
speed and direction at the same timeEx. Roller Coaster
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Constant AccelerationA steady change in velocityAn airplane’s acceleration may be
constant during a portion of its takeoff.
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Calculating AccelerationRate at which velocity changes
Vi is the initial velocity, vf is the final velocity, and t is total time.
If the velocity increases, the acceleration is positive.
If the velocity decreases, the acceleration is negative.
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Calculating Acceleration
1. A ball rolls down a ramp, starting from rest. After 2 seconds, its velocity is 6 meters per second. What is the acceleration of the ball?
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Calculating Acceleration
2. A car traveling at 10 m/s starts to decelerate steadily. It comes to a complete stop in 20 seconds. What is its acceleration?
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Calculating Acceleration
3. An airplane travels down a runway for 4.0 seconds with an acceleration of 9.0 m/s2. What is its change in velocity during this time?
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Calculating Acceleration
4. A child drops a ball from a bridge. The ball strikes the water under the bridge 2.0 seconds later. What is the velocity of the ball when it strikes the water?
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Acceleration GraphsAcceleration is the slope of a speed-time
graphThe slope is change in speed divided by
time
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Speed VS TimeThe skier’s acceleration is positive. The
acceleration is 4 m/s2.
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Speed VS TimeThe biker moves at a constant speed and
then slows to a stop.
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Distance VS TimeAccelerated motion is represented by a curved line on a distance-time graph. In a nonlinear graph, a curve connects the data points that are plotted.
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Instantaneous AccelerationInstantaneous acceleration is how fast a
velocity is changing at a specific instant.