Question 1

Which of the following best describes Newton's First Law of Motion?

Accepted Answer

An object will remain at rest or move at constant velocity unless acted upon by a nonzero net force.

Question 2

A hockey puck slides across frictionless ice at a constant speed. According to Newton's First Law, what is the net force acting on the puck?

Accepted Answer

$$F_{	ext{net}} = 0$$

Question 3

Galileo used inclined planes in his experiments primarily to:

Accepted Answer

Eliminate the acceleration of free fall and study inertia.

Question 4

A cart is pulled to the right with a force of 15 N and to the left with a force of 20 N. What is the net force acting on the cart?

Accepted Answer

$$5\ 	ext{N} to $$the left

Question 5

Which of the following is a vector quantity?

Accepted Answer

Force

Question 6

Two forces of $$30\ 	ext{N}$$ and $$40\ 	ext{N}$$ act at right angles to each other on an object. What is the magnitude of the resultant force?

Accepted Answer

$$50\ 	ext{N}$$

Question 7

If you stand with one foot on each of two bathroom scales and your weight is evenly distributed, what will each scale read?

Accepted Answer

Half your weight

Question 8

A bowling ball is rolling at a constant speed in a straight line. Which type of equilibrium is it in?

Accepted Answer

Dynamic equilibrium

Question 9

You push a crate at a steady speed in a straight line with a force of $$75\ 	ext{N}. $$What is the magnitude of the friction force?

Accepted Answer

Equal to $$75\ 	ext{N}$$

Question 10

A person riding in a car moving at a constant speed tosses a coin straight upward. Where will the coin land?

Accepted Answer

In the person's hand

Question 11

Which of the following statements about inertia is correct?

Accepted Answer

Inertia depends on the mass of an object.

Question 12

A bag of flour hangs at rest from a string. The forces acting on the bag are:

Accepted Answer

Tension force upward and gravitational force downward, equal in magnitude and opposite in direction.

Question 13

Which equation represents the equilibrium rule for forces acting on an object?

Accepted Answer

$$\sum F = 0$$

Question 14

A book rests on a table. What is the support force acting on the book?

Accepted Answer

The upward force exerted by the table, equal in magnitude to the book's weight.

Question 15

Which of the following is NOT a scalar quantity?

Accepted Answer

Force

Question 16

A ball rolling on a horizontal plane eventually comes to rest. According to Galileo, what is the reason for this?

Accepted Answer

It is due to friction acting on the ball.

Question 17

Which rule is used to find the resultant of two vectors that are not in the same or opposite direction?

Accepted Answer

Parallelogram rule

Question 18

If an object is moving at constant speed in a straight line, which of the following is true?

Accepted Answer

It is in dynamic equilibrium.

Question 19

Which of the following best explains why a bird can swoop from a branch to catch a worm even though the Earth is moving?

Accepted Answer

Due to inertia, the bird, branch, and worm all move with the Earth.

Question 20

A person pulls a box to the right with $$10\ 	ext{N}$$ and another person pulls to the left with $$15\ 	ext{N}. $$What is the net force and direction?

Accepted Answer

$$5\ 	ext{N} to $$the left

Newton's First Law of Motion—Inertia: Foundations, Forces, and Equilibrium

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