V ector quantity magnitude value amp direction R ate at which an object changes its velocity How fast an object is getting faster If the velocity of an object is changing it is accelerating ID: 778128
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Slide1
Acceleration
Slide2Definition: AccelerationVector quantity: magnitude (value) & direction
R
ate
at which an object changes its velocity. “How fast an object is getting faster”
If the velocity of an object is changing, it is accelerating!
Slide3Definition: Acceleration“How fast an object is getting faster”Every second, object goes 10 m/s faster
to the north
Units are:
Meters per second per secondm/s/s
Slide4Equation: Acceleration
a
=
Slide5Animation: AccelerationPhysics Classroom: Acceleration Animation
Slide6Constant AccelerationVelocity changes by a constant amount each second
.
The magnitude can change. (How fast it is going)
And/or…. The direction can change.An
object with a constant velocity is not accelerating. In this class, ALL acceleration will be constant.
Slide7Accelerating Objects Are
Changing Their Velocity
Slide8Equation: Acceleration
=
A car goes from 0 m/s to 40 m/s in 10 seconds.
What is the acceleration of the car?
Accel
=
=
=
= 4
m/s
/s
Slide9Acceleration
=
Velocity
(final)
- Velocity(original)
time
A car traveling at 60 mph accelerates
to 90
mph in 3 seconds. What is
the car’s
acceleration?=90 mph - 60 mph
3 seconds
=
30 mph
3 seconds
=
10 mph/second
Slide10Study in AccelerationRocket Sled
Slide11Slide12Slide13Graphing: Acceleration
Position vs. Time
Velocity vs. Time
Accel
. vs. Time
Slope of x vs. t = velocity
Slope of v vs. t = acceleration
Slide14Graphing: Acceleration
Slide15Change in Velocity
Slide16- Speed vs Time Graph: Constant acceleration produces a straight line (linear slope, rise/run
a = v/t
Slide17Free fallThe constant acceleration of an object moving only under the force of gravity (g
)
.
The acceleration caused by gravity is 10 m/s2If there was no air, all objects would fall at the same speedDoesn’t depend on mass
After 1 second falling at 10 m/sAfter 2 seconds 20 m/s3 seconds 30 m/s
Slide18FallingAir resistance will increase as it falls fasterAn upward force on the object
Eventually gravity will balance with air resistance
Reaches terminal velocity - highest speed reached by a falling object.
Slide19Terminal velocityForce of gravity is constant
air resistance increases as you speed up
until the force is equal
Equal forces, no
acceleration
constant velocity
terminal velocity
Slide20Balloon RacersWhat will happen if I let go of the blown up balloon?Why did that happen?How can we measure the speed, distance or acceleration of the balloon?
A track?
Attach the balloon
to something?