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Chapter 2 Motion
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EXERCISE
A motorboat starting from rest travels in a straight line on a lake.
(ajif the boat achieves a speed of 8.0 m/s in 10s, what is the boat's average
acceleration?
(bIThen, in 5.0 more seconds, the boat's speed is 12 m/s. What
is the boat's average acceleration for the total time?
34
8
ee Ciee le tovlity h
W de e =2
W tee mn t1
35
Acceleration of Free Fall objects
> Objects in motion solely under the influence of gravity
are said to be in free fall.
The acceleration due to gravity at the Earth's surface is
directed downward and is denoted by the letter g. Its
magnitude in SI units is
g- 9.81 m/s?
* Frictional effects (such as air resistance) are negligible.
4
8
12
16
36
t (s)
ruestion: Consider the motion of the object whose velocity-time graph is given in the diagram.
Acceleration of Free Fall objects
Consider a constant acceleration of 9.8 m/s2,
Because the velocity increases, the
displacement traveled by the falling
object each second also increases, but
not uniformly
1. What is the acceleration of the object between times t = 0 and t = 2?
2. What is the acceleration of the object between times t = 10 and t =
12?
3. What is the net displacement of the object between times t = 0 and t = 16?
37
* The velocity of a freely falling object on the Earth increases 9.80
m/s each second but the distance covered is not uniform because
the object speeds up. This distance con be found using
d =
g t2
38
* Air resistance is the result of a moving object colliding with air
molecules. Therefore, air resistance (considered a type of
friction) depends on an object's size and shape, as well as on its
speed.
* The larger the object (or the more downward area exposed)
the more collisions and the more air resistance there will be.
* The velocity of a freely falling object on the Earth increases 9.80
m/s each second but the distance covered is not uniform becouse
the object speeds up. This distance can be found using
Acceleration of Free Fall objects
39
(s/u) a
II
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