Knight Chapter 4

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According to Newton's third law, when a hammer exerts a downward force on a nail, the nail exerts an equal force on the hammer, directed ___________.

sideways

nowhere

downward

upward (correct)

What is the relationship between force and acceleration?

Directly proportional (correct)

Inversely proportional

No relationship

Depends on the situation

Which way does an object's weight vector always point?

Horizontally

Upward

Vertically downward (correct)

In the direction of motion

What force prevents an object from sliding on a surface?

Static friction Signup and view all the answers

Which type of friction opposes the motion of a sliding object?

Kinetic friction Signup and view all the answers

What force is exerted by a surface and is perpendicular to the surface?

Normal force Signup and view all the answers

According to Newton's first law of motion, an object that has no forces acting on it will

move in a straight line at a constant speed Signup and view all the answers

According to the text, what is the relationship between forces and motion?

Forces are necessary to start motion, but not to keep it going Signup and view all the answers

Which of the following best describes a force?

A force is a push or a pull. Signup and view all the answers

What is the difference between contact forces and long-range forces?

Contact forces require physical contact, while long-range forces act without physical contact. Signup and view all the answers

What happens to air resistance as the speed of an object increases?

Air resistance increases Signup and view all the answers

Knight Chapter 4

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Questions and Answers

According to Newton's third law, when a hammer exerts a downward force on a nail, the nail exerts an equal force on the hammer, directed ___________.

What is the relationship between force and acceleration?

Which way does an object's weight vector always point?

What force prevents an object from sliding on a surface?

Which type of friction opposes the motion of a sliding object?

What force is exerted by a surface and is perpendicular to the surface?

According to Newton's first law of motion, an object that has no forces acting on it will

According to the text, what is the relationship between forces and motion?

Which of the following best describes a force?

What is the difference between contact forces and long-range forces?

What happens to air resistance as the speed of an object increases?

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