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Describe the Motion Below

Velocity? / Acceleration?

 

Amusing Surface Tension Experiment

 

V. Finding displacement using V vs t graphs

since V = d/t

 

then d = Vt

=

Area under the plot

= displacement (distance) 

 

 

 

 

 

Ex) What is the displacement this object covered from t = 0 to t = 6 seconds?

d = Area of the triangle:

 

 

 

 = 1/2bh

 

 

 

= 1/2(6 sec)(70m/sec)

 

 

= 210 m

 

Ex 1)

Object's displacement from
 t = 1 sec to t = 3 sec?

 

 

 

 

 

 

d = Area = base x height

 

 

 

= (2 sec)(10 m/sec) = 20 m

 

 

 

 

 

 

Ex 2) Object's displacement from t = 6 sec to t = 8 sec ?



d = area of trapezoid

 

= 1/2 (h1 + h2) x base

 

 

 

d =  (25 m/s + 10 m/s) (2 sec)
  2    

 

 

 

= 35 m

 

 

Smallest displacement?

| Flash|
St. Mary's Physics

 

 

 

Largest B, Smallest D

 

 

 

AP Question

Ex 3)

a) Find displacement after 4 seconds

b) At what time does the object return to its starting point?

After 4 seconds:

1/2(3 sec)-10 m/s + 1/2(1 sec)10 m/s

-15 m + 5 m

= -10 m

 

 

Answer: 5 seconds when d = 0

 

Ex 4)

When did car A catch up to car B?

 

Car A caught up to car B when their d are equal

 

At 60 sec:

Car  B: d= 60 m/s(30 sec) = 180 m

Car A: d =1/2(60 m/s)(60 sec) = 180 m

 

 

Free Fall

 

 

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