  Home  Describe the Motion Below

Velocity? / Acceleration? Amusing Surface Tension Experiment

Video Instruction

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V. Finding displacement using V vs t graphs since V = Δd/t

then Δd = 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?

Show Me The 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  