Post on 28-May-2020
How Do You Describe An Object’s Position?
Where is the treasure?
Come up with at least 3 ways to communicate
this information!
Write them on your white boards!
What’s the difference?
Distance
Displacement
In Physics, an object’s position can be described using the following terms.
Classify our treasure locations as either distance or displacement.
Distance Displacement
Classifications
All quantities can be categorized as either a scalar or a vector.
What’s the difference?
Scalar - Quantity with a magnitude only.
Vector - Quantity with a magnitude and direction.
Which of our quantities is a vector?
Distance Displacement
Brain Dump!On your white boards, identify all the different physics quantities you know!
mass
speed weight
velocity
acceleration force
energy
momentumtorquetemperature
Which Ones are Vectors?
Circle the quantities that are vectors!
mass
speed weight
velocity
acceleration force
energy
momentumtorquetemperature
Vector Properties
A vector can be drawn anywhere in space!
Which vector is shown twice?
Vector Properties
We can change the magnitude or direction of a vector by multiplying by a constant.
a x 2 a2a
a x -2 a
-2a
A More Direct Path!
The directions that your wrote to go straight to the treasure is the sum of all of your vectors.
Known as the resultant!
a +b = a
b
R
Vector resultants are found by drawing vectors tip to tail!
Analytical Pirates
Given the directions, you could determine the treasure’s location before you even left the boat!
Let’s put our pirate hats back on a figure it out!
Which is more reliable?
Analytic Method Graphical Method
Do you want more practice?