Chapter 1,2

Lucy Lightfoot stands with one foot on one bathroom scale and her other foot on a second bathroom scale. Each scale reads 335 N. What is Lucy's weight? Express your answer with the appropriate units.

W = 670 N

What is the net force on the book? 24 newtons up 12 newtons up 12 newtons down 0 newtons

0 newtons

A 12-NN book is at rest on a flat table. How many newtons of support force does the table provide? 12 newtons up 0 newtons 12 newtons down 24 newtons up

12 newtons up

Why is force a vector quantity? A force has a magnitude and a direction. A force is a scalar quantity. A force is measured in pounds, and pounds are a vector quantity. A force has a magnitude, but not a direction.

A force has a magnitude and a direction.

Briefly, what is science? Science describes the order in nature and the causes of that order. Science is a way of knowing about the world and making sense of it. Science creates testable laws and theories. All of the above.

All of the above

Why is physics considered to be the basic science? Physics involves matter that is alive. Physics is about how atoms combine to form molecules. As physicist Paul Tipler says about sciences other than physics, "What other sciences?" Because all other sciences can be shown to be derived from it.

Because all other sciences can be shown to be derived from it.

Calculate the net force produced by a 40-N force and a 20-N force if both forces act in the same direction. Express your answer with the appropriate units.

Fa = 60 N

Calculate the net force produced by a 40-N force and a 20-N force if both forces act in opposite directions. Express your answer with the appropriate units.

Fb = 20 N

A table rests on a floor without being pushed. How much friction acts on it? Express your answer with the appropriate units.

Ff = 0 N

A table rests on a floor without being pushed. If the table is pushed horizontally with 150 N and doesn't slide, how much friction acts on it? Express your answer with the appropriate units.

Ffr = 150 N

A table rests on a floor without being pushed. If a horizontal push of 190 N causes it to slide at constant speed, how much friction acts on it? Express your answer with the appropriate units.

Ffr = 190 N

What are steps of the scientific method. Assembling and organizing facts and checking them against dogma. Using Occam's razor to eliminate excess facts. Reasoning and derivation from axioms. Hypothesis, predictions, and experimental findings.

Hypothesis, predictions, and experimental findings.

What type of path does a moving object follow in the absence of a force? It continues to move in a straight line at a constant speed. It follows a parabolic trajectory in the absence of a force. It follows a circular path in the absence of a force. It moves in a straight line and eventually slows to a stop.

It continues to move in a straight line at a constant speed.

Why are students of the arts encouraged to learn about science and science students encouraged to learn about the arts? Knowing both the arts and sciences makes for a wholeness in the way we view the world. Scientists need to learn to draw and artists need to learn how to solve equations. Scientists need to relax by viewing art and artists need the discipline of learning science. Scientists need to learn how to write and writers need to learn what is impossible to do according to science.

Knowing both the arts and sciences makes for a wholeness in the way we view the world.

How much force is required to keep a moving hockey puck in motion on a perfectly frictionless surface? The force should be applied in the direction of movement of the puck. The force should be applied in the opposite direction to the movement of the puck. No force is required for continued motion.

No force is required for continued motion.

Clearly distinguish between science and technology. Technology solves problems, whereas science creates them. Science is applied technology. Science gathers the knowledge that technology uses for practical purposes. Technology can be helpful or harmful, while science is only helpful.

Science gathers the knowledge that technology uses for practical purposes.

What is the net force on a cart that is pulled to the right with 100 pounds of force and to the left with 30 pounds of force? The net force is zero. The net force is 70 pounds to the right. The net force is 130 pounds. The net force is 70 pounds to the left.

The net force is 70 pounds to the right.

What is the net force on an object that is pulled with 80 NN to the right and 80 NN to the left? The net force is 160 newtons to the right. The net force is 113 newtons downward. The net force is zero newtons. The net force is 113 newtons upward.

The net force is zero newtons.

Henry Heavyweight weighs 1410 NN and stands on a pair of bathroom scales so that first scale reads twice as much as the second one. What are the scale readings? Enter your answers in newtons separated by a comma.

W1,W2 = 940,470 N

A bowling ball at rest is in equilibrium. Is the ball in equilibrium when it moves at constant speed in a straight-line path? The bowling ball is not in equilibrium because the wood of the bowling alley exerts an upward force on the ball. Yes, the bowling ball is in equilibrium because ΣF=0ΣF=0. The bowling ball is not in equilibrium because it is moving. The bowling ball is not in equilibrium because ΣF=−mgΣF=−mg.

Yes, the bowling ball is in equilibrium because ΣF=0ΣF=0.