For the books in the given figure, there is a force $F$ from the table supporting the book on the bottom. Identify two action-reaction force pairs for each of the following objects: (a) the table, (b) the book on top, (c) the book on the bottom, and (d) the Earth.

Imagine a skydiver who waits a long time before opening her parachute. For simplicity, assume she moves along a straight line.

(a) In what direction is the skydiver moving (what is the direction of her velocity) just before she opens her parachute?

(b) Suppose that when she finally opens her parachute, she is traveling faster than her terminal speed with the parachute open. What is the direction of the skydiver's acceleration just after she opens her parachute?

An object with an initial velocity of $12 \mathrm{~m} / \mathrm{s}$ accelerates uniformly for $25 \mathrm{~s}$.

(a) If the final velocity is $45 \mathrm{~m} / \mathrm{s}$, what is the acceleration?

(b) How far does the object travel during this time?

Imagine that you are a passenger on the International Space Station. While on the station, you are "weightless" and so is everything else, including wrenches and furniture. Even though everything appears weightless, explain why mass still matters. Why does it still take longer for a given force to move a massive object a certain distance than to move an object with a very small mass the same distance?

Suppose you are the newly graduated astronaut preparing for your first trip into space. Plans call for your spacecraft to reach a velocity of $500 \mathrm{~m} / \mathrm{s}$ after $2.4 \mathrm{~min}$. If your mass is $75 \mathrm{~kg}$, what force will be exerted on your body?

When most people are subjected to an acceleration greater than about $5 \times g$, they will usually become unconscious ("black out"). Will you be in danger of blacking out?

A spacecraft that is initially at rest turns on its engine at $t=0$. If its mass is $m=3000 \mathrm{~kg}$ and the force from the engine is $45 \mathrm{~N}$, what is the acceleration of the spacecraft?A spacecraft that is initially at rest turns on its engine at $t=0$. If its mass is $m=3000 \mathrm{~kg}$ and the force from the engine is $45 \mathrm{~N}$, what is the acceleration of the spacecraft?

There are two forces acting on the person in the given figure: the force of gravity $\vec{F}_{\text {grav }}$ and $\vec{N}$, the normal force from the floor. These forces are equal in magnitude and opposite in direction. Are they an action-reaction pair? Explain why or why not. If not, identify the reaction force to $\vec{N}$.

Identify an action-reaction pair of forces in each of the following situations.

(a) A person pushing on a wall

(b) A book resting on a table

(c) A hockey puck sliding across an icy surface

(d) A car accelerating from rest (Hint: Consider the tires.)

(e) An object undergoing free fall in a vacuum

(f) A basketball player jumping to dunk a basketball

(g) A person throwing a baseball

Identify an action-reaction pair of forces in each of the following situations.

(a) A person pushing on a wall

(b) A book resting on a table

(c) A hockey puck sliding across an icy surface

(d) A car accelerating from rest (Hint: Consider the tires.)

(e) An object undergoing free fall in a vacuum

(f) A basketball player jumping to dunk a basketball

(g) A person throwing a baseball

Describe the relative amounts of potential and kinetic energy for a book in the following situations. a. The book on a high shelf which is 2 meters off the ground. b. The book after it has fallen off the 2-meter shelf and is now 1 meter off the ground. c. The book just before it hits the ground.

The coefficients of static and kinetic friction between the $0.4-\mathrm{kg}$ book and the table are $\mu_s=0.30$ and $\mu_{\mathrm{k}}=0.28$. A person exerts a horizontal force on the book as shown. (a) If the magnitude of the force is $1 \mathrm{~N}$ and the book remains stationary, what is the magnitude of the friction force exerted on the book by the table? (b) What is the largest force the person can exert without causing the book to slip? (c) If the person pushes the book across the table at a constant speed, what is the magnitude of the friction force?

Book reviewers criticized the pop star's book, saying that it was nothing more than a collection of ______ that is neither moving nor entertaining.

You borrow a book from the library to read during your vacation. On the first day of vacation, you read one quarter of the book. On the second day, you read half of the remaining pages. On the third day, you finish the last 120 pages of the book. How many pages does the book have?

Kristi is shopping online for gifts for her friends.

Prices for the book varied $\$ 2.25$ from the average. Write the range of average book prices.