Question 1

According to Newton's First Law of Motion, what will happen to an object moving at a constant velocity if no net force acts on it?

Accepted Answer

It will continue moving at the same velocity in a straight line.

Question 2

Which of the following best describes Galileo's concept of inertia?

Accepted Answer

Inertia is the tendency of an object to resist changes in its motion.

Question 3

A box is pulled to the right with a force of 25 N and to the left with a force of 10 N. What is the net force acting on the box?

Accepted Answer

$$15\ \mathrm{N} to $$the right

Question 4

Which of the following is a scalar quantity?

Accepted Answer

Mass

Question 5

A book rests on a table. Which force is responsible for supporting the book against gravity?

Accepted Answer

Support force (normal force)

Question 6

If you stand on two bathroom scales with your weight evenly distributed, what does each scale read?

Accepted Answer

Half your weight

Question 7

A hockey puck slides at constant speed on frictionless ice. Which statement is true?

Accepted Answer

It is in dynamic equilibrium.

Question 8

Which of the following is NOT a vector quantity?

Accepted Answer

Speed

Question 9

A crate is pushed at a steady speed in a straight line. If the friction force is $$60\ \mathrm{N}$$, how much force must you apply?

Accepted Answer

Equal to $$60\ \mathrm{N}$$

Question 10

Which of the following best explains why a coin tossed straight up inside a moving train lands back in your hand?

Accepted Answer

The coin continues to move with the train due to inertia.

Question 11

Which rule states that the vector sum of forces acting on a nonaccelerating object equals zero?

Accepted Answer

The equilibrium rule

Question 12

A ball is rolling on a horizontal surface and comes to a stop. According to Galileo, why does it stop?

Accepted Answer

Because of friction

Question 13

Which of the following statements about equilibrium is correct?

Accepted Answer

An object in equilibrium can be moving at constant velocity.

Question 14

If two forces of $$8\ \mathrm{N}$$ and $$6\ \mathrm{N}$$ act in opposite directions on an object, what is the magnitude and direction of the net force?

Accepted Answer

$$2\ \mathrm{N} in $$the direction of the larger force

Question 15

Which of the following is an example of static equilibrium?

Accepted Answer

A book resting on a table

Question 16

A rope supports a hanging mass. If the mass is doubled, what happens to the tension in the rope?

Accepted Answer

It doubles.

Question 17

Which of the following best describes a net force?

Accepted Answer

The combination of all forces acting on an object, considering both magnitude and direction

Question 18

If a vector of $$3\ \mathrm{N}$$ acts east and another vector of $$4\ \mathrm{N}$$ acts north, what is the magnitude of the resultant vector?

Accepted Answer

$$5\ \mathrm{N}$$

Question 19

Which of the following is a correct application of the parallelogram rule?

Accepted Answer

Adding two vectors at right angles to find the resultant

Question 20

A person pushes a box across the floor at a constant speed. Which statement is true about the forces acting on the box?

Accepted Answer

The applied force is equal to the friction force.

Newton’s First Law of Motion — Inertia: Study Notes

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