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 upon it?

Accepted Answer

It will continue moving at a constant velocity in a straight line.

Question 2

A 10 kg box rests on a table. What is the magnitude of the support force (normal force) acting on the box? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$98\ \mathrm{N}$$

Question 3

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 4

A cart is pulled to the right with a force of $$25\ \mathrm{N}$$ and to the left with a force of $$15\ \mathrm{N}. $$What is the net force acting on the cart?

Accepted Answer

$$10\ \mathrm{N} to $$the right

Question 5

Which of the following is a vector quantity?

Accepted Answer

Force

Question 6

If you stand with one foot on each of two identical bathroom scales and your weight is 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

The puck is in dynamic equilibrium.

Question 8

You push a crate 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 9

Which of the following statements about the equilibrium rule is correct?

Accepted Answer

It applies to vector quantities.

Question 10

A ball is suspended by two ropes at different angles. Which side has the greater tension?

Accepted Answer

The side with the smaller angle to the vertical

Question 11

A car is moving at a constant velocity. Which of the following must be true?

Accepted Answer

The net force on the car is zero.

Question 12

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 retains the horizontal velocity of the train due to inertia.

Question 13

Which of the following is NOT a correct statement about Aristotle's ideas of motion?

Accepted Answer

Objects in their proper place will strive to move away from it.

Question 14

A box is at rest on a horizontal surface. Which of the following statements is true?

Accepted Answer

The support force equals the weight of the box.

Question 15

Two forces, $$F_1 = 8$$\ \mathrm{N}$$ to the right and F_2$ = 6\ \mathrm{N} to $$the left, act on an object. What is the net force?

Accepted Answer

$$2\ \mathrm{N} to $$the right

Question 16

Which of the following is an example of static equilibrium?

Accepted Answer

A book resting on a table

Question 17

Which equation represents the equilibrium rule for forces?

Accepted Answer

$$\sum F = 0$$

Question 18

A vector has which of the following properties?

Accepted Answer

Both magnitude and direction

Question 19

If two forces of $$7\ \mathrm{N}$$ and $$24\ \mathrm{N}$$ act at right angles to each other, what is the magnitude of the resultant force?

Accepted Answer

$$25\ \mathrm{N}$$

Question 20

Which of the following is a scalar quantity?

Accepted Answer

Mass

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

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