EBK BASIC BIOMECHANICS
7th Edition
ISBN: 9780100409453
Author: Hall
Publisher: YUZU
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Chapter 10, Problem 7IP
A soccer ball is kicked with an initial horizontal speed of 5 m/s and an initial vertical speed of 3 m/s. Assuming that projection and landing heights are the same and neglecting air resistance, identify the following quantities:
a. The ball’s horizontal speed 0.5 s into its flight
b. The ball’s horizontal speed midway through its flight
c. The ball’s horizontal speed immediately before contact with the ground
d. The ball’s vertical speed at the apex of the flight
e. The ball’s vertical speed midway through its flight
f. The ball’s vertical speed immediately before contact with the ground
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What are the instances in your everyday life
where inertia plays a role. Determine whether these are beneficial or harmful effects of inertia.
For the harmful effects of inertia, identify ways by which resulting problems are addressed.
1.Beneficial effects of
inertia…
2.Harmful effects of inertia…
3.How the problem is or can be solved
Based on the acceleration in the above ball rolling down an inclined plane (with vo = 0 meters per second), how far would it have traveled along the inclined plane in the first six seconds of rolling?
9 meters
16 meters
25 meters
36 meters
49 meters
A scientist was investigating if differences in the frictional work performed on a model car can change
depending on its mass (in grams) and whether the car moves up or down an inclined plane. They decided to
measure the amount of frictional force experienced by the model car and the distance it traveled in meters.
The scientists were able to evaluate the frictional work using the following data.
Mass (g)
Distance (m) Force
Work Done by Friction (J)
car going up the incline
100
39
0.063
2.457
car going down the incline 70
39
0.2309 ?
It is known that the relationship between force and distance determines the work done by friction (W+).
W₁ = fd
Wf work done by friction
f = force
d = distance
Question:
How much work done by friction was exerted on the car as it moved down the inclined plane?
You may use a calculator.
1
2.457
9.005
11.46
16.16
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Chapter 10 Solutions
EBK BASIC BIOMECHANICS
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