Transcript Document 7410714

Constant Speed
Non-constant speed (changing)
Average speed (Vav) = instantaneous speed
Average speed (Vav) ≠ instantaneous speed
Slope measured from graph line
Slope measured from tangent line
- has both a number and a unit.
Distance is a
scalar quantity
We say that distance has a magnitude
(number and unit). It is a scalar property.
- has both a magnitude and a direction.
Distance is not
a vector quantity
Distance has only magnitude (number
and unit). It is a scalar quantity.
- the space between two points is the distance.
- the change of position of an object
Displacement is
a vector quantity
Displacement has both magnitude
and direction. It is a vector quantity.
Distance (∆d) =
3.5 km
Displacement (∆đ) =
500 m [North]
After a fun day of exciting
science classes, _________
walks home from school.
Number (value)
Unit
Magnitude
Distance (∆d)
Displacement (∆đ)
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
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
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Direction
Scalar Quantity
Vector Quantity


Find the displacement of the train from point (a) to point (b)
1. What is our reference point (origin)?
2. What is the positive direction and what is the negative direction?
3. Use our equation
4. Solve using our values from the picture
- has both a number and a unit.
Speed is a
scalar quantity
We say that speed has a magnitude
(number and unit). It is a scalar property.
- has both a magnitude and a direction.
Speed is not a
vector quantity
Speed has only magnitude (number
and unit). It is a scalar quantity.
- the rate of change of distance.
- the rate of change of displacement.
Velocity is a
vector quantity
Velocity has both magnitude and
direction. It is a vector quantity.
Speed (v)
Number (value)
Unit
Magnitude



Direction
Scalar Quantity
Vector Quantity
Velocity(






)
∆đ
∆t
What is the average velocity of the hiker after 20 minutes?
Speed and distance will always be positive
Velocity and displacement can have negative values
- an object has uniform motion if it
is traveling at constant velocity.
Uniform Motion
=
Constant Velocity
If an object is traveling at constant speed
with a constant direction then it has
constant velocity.