1. Kinematics (Part 2)

2. Solving Kinematics Problems
3 very important Equations… Get Your equation sheet

3. Average Velocity Vector Quantity Could have a negative value
Change in position divided by change in time
Δ = delta  “change in”
v = Δ d (df – di) “f” = final or end
Δ t (tf – ti) “i” = initial
Units are things like (mi/hr, km/hr, m/s)

4. Distance Scalar Quantity Simple manipulation of previous equation
Δ D = v x Δ t
Units are things like (m, km, mi)

5. Average Acceleration Vector Quantity
Change in velocity divided by change in time
a = Δ v (vf – vi)
Δ t (tf – ti)
Units are m/s2

6. Solving Kinematics Problems
Use the guess Method

7. GUESS Method
A systematic way to not only set up the problem, but also solve the problem and get the correct answer.
“G” – write down what is given
“U” – write down the unknown
“E” – write down the equation to be used
“S” – substitute values into equation
“S” – solve the problem

8. Example Problem #1
How long will it take to travel 50.0 miles in a car traveling at 65 mi/hr? d= 50.0 miles v= 65 mi/hr t=?s Δd = v x t so… t = Δd/v
t= (50.0mi)/(65mi/hr)
t= 0.77 hr

9. Example Problem #2
A car is traveling at 18.5 m/s. The driver steps on the gas to pass a garbage truck. After 5.0 seconds, the car is traveling at 24.5 m/s. What is the car’s rate of acceleration? vi = 18.5 m/s vf = 24.5 m/s t = 5.0 s a = ??? a = Δv / Δt
a = (24.5 m/s – 18.5 m/s)
(5.0 sec)
a = 1.2 m/s2