Chapter 14, Astronomical Motion: Inertia, Mass, and Force Video Solutions, Pathways to Astronomy

Problem 1

Which do you think has more inertia-a small inflated balloon or a bowling ball? If each were moving toward you at 1 meter per second (1 $\mathrm{m} / \mathrm{sec}$ ), which would be easier to catch? Why?

Kara Merfeld

Numerade Educator

05:14

Problem 2

Which do you think has more momentum, a bowling ball moving at $1 \mathrm{m} / \mathrm{sec}$ on the Earth, or a bowling ball moving at $1 \mathrm{m} / \mathrm{sec}$ on the Moon? Is there any difference?

Kara Merfeld

Numerade Educator

06:29

Problem 3

In some amusement park rides, you are spun in a cylinder and pressed against the wall as a result of the spin. People sometimes describe that effect as being due to "centrifugal force." What is really holding you against the wall of the spinning cylinder? Drawing a sketch and using Newton's first law may help you answer this question.

Matty Anderson

Numerade Educator

00:09

Problem 4

A cinder block can be weightless in space. Would you be hurt if you kicked it with your bare foot while it was weightless in space? Explain your answer using Newton's first law.

Shoukat Ali

Other Schools

02:40

Problem 5

Consider the situation shown in Figure 14.4 . If the speed of the ball were higher, would this require a greater or lesser force applied by the string?

Prabhakar Kumar

Numerade Educator

01:17

Problem 6

Forces in the MKS system are given in units called "newtons," where 1 newton acting for 1 second on a 1 -kilogram-mass object will change the object's velocity by $1 \mathrm{m} / \mathrm{sec}$. For example, suppose an object with a mass of $20 \mathrm{kg}$ is moving at a rate of 6 $\mathrm{m} / \mathrm{sec}$ in a straight line. A force of 30 newtons acting opposite the direction of motion of the object for 4 sec will bring the object to a halt.
a. What do you think the resulting motion of the object would be if the force acted in the opposite direction?
b. How do you think the object would behave if the force continued after 4 sec?

Prabhu Ramji

Numerade Educator