Kinematics - Cornell Notes Template Page 2
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1
2
3Kinematics
Acceleration Due to gravity
I. Earth’s gravity accelerates any free falling object at a constant rate of
What is acceleration due to
2
gravity?
9.81 m/s
assuming negligible air resistance
Kinematics Equations
I. Each equation is to be used when 3 pieces of information have been
given and the fourth is to be calculated. One variable will be omitted
– v
/ Δt
What are the five kinematics
a. a = v
f
i
2
b. Δd = v
Δt + ½ a Δt
equations and when is it
i
c. Δd = (v
) Δt / 2
appropriate to use them?
+ v
i
f
2
2
= 2 a Δd + v
d. v
f
i
2
e. Δd = v
Δt – ½ a Δt
f
Vector Scale Diagrams
What are vector scale
I. When a vector arrow points in a direction that is not one of the 4 main
diagrams?
directions (N, S, E, W), it is referenced by an angle from the closest
main direction
II. It is necessary to draw the size of your arrow to a certain scale like
1 cm = 1 km
Adding and Subtracting Vectors
What are the methods used to I. To add, this is done head-to-tail and the resultant vector is the vector
determine a resultant vector?
that connects the tail of the first vector to the head of the second vector
a. When using a scale diagram, the resultant vector can be determined
How do you add and subtract
using a ruler and a protractor
vectors?
b. The resultant vector can also be determined using simple trig, trig
laws, and the Pythagorean theorem
II. To subtract, simply add the compliment of the second vector to the first;
(compliment of a vector is the original facing the other way)
Average Velocity and Relative Motion
How is average velocity
I. The average velocity can be determined by calculating the resultant
= Δd
/ Δt
determined?
displacement by the time interval: v
av
R
What is relative motion?
II. Relative motion can occur when there are various frames of motion like
Walking on a boat, moveable walkways, swimming in a current, etc.
a. The resultant velocities vary depending on the observer’s location
b. A boat travels 25 km/h [S], man walks 5 km/h [N], then R = 25 -5,
and the resultant velocity is 20 km/h [S]
2
Any object in freefall experiences an acceleration of 9.81 m/s
(down), neglecting air resistance.
– v
/ Δt *, * Δd = v
Δt + ½ a Δt
2
*, * Δd = (v
) Δt / 2 *,
There are 5 major kinematic equations: * a = v
+ v
f
i
i
i
f
2
2
2
= 2 a Δd + v
*, and * Δd = v
Δt – ½ a Δt
* v
*. Vector diagrams can be drawn to scale and the
f
i
f
resultant vector can be determined using a ruler and protractor. Another method is mathematics.
= Δd
/ Δt *. Relative motion can occur when there is more
Average velocity can be determined: * v
av
R
than one frame of motion.
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