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 the same velocity in a straight line.

Question 2

A hockey puck slides across a frictionless ice surface at a constant speed. Which of the following statements best describes the forces acting on the puck?

Accepted Answer

There is no net force acting on the puck.

Question 3

Which of the following is a vector quantity?

Accepted Answer

Force

Question 4

A cart 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 cart?

Accepted Answer

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

Question 5

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 6

A box is at rest on a table. Which of the following pairs of forces are acting on the box?

Accepted Answer

Gravity downward and support force upward

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 crate is pushed at a steady speed across a floor. If the friction force is $$60\ \mathrm{N}$$, how much force must you apply to keep it moving at constant speed?

Accepted Answer

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

Question 9

Which of the following statements about equilibrium is correct?

Accepted Answer

An object in equilibrium can be moving at constant velocity.

Question 10

A student tosses a ball straight up while riding in a bus moving at constant velocity. Where will the ball land relative to the student?

Accepted Answer

In the student's hand

Question 11

Which of the following is NOT a correct statement about vector quantities?

Accepted Answer

They have only magnitude.

Question 12

A ball is rolling on a horizontal surface and comes to a stop. According to Galileo, what is the most likely reason for the ball stopping?

Accepted Answer

Friction is acting on the ball.

Question 13

Which of the following best describes the equilibrium rule in equation form?

Accepted Answer

$$\sum \vec{F} = 0$$

Question 14

Two forces act on an object: $$8\ \mathrm{N} to $$the right and $$6\ \mathrm{N} to $$the left. What is the magnitude and direction of the net force?

Accepted Answer

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

Question 15

Which of the following is a scalar quantity?

Accepted Answer

Mass

Question 16

A person is hanging from two ropes at different angles. Which rope will have the greater tension?

Accepted Answer

The rope at the larger angle with respect to the vertical

Question 17

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

Accepted Answer

The bird, tree, and worm all share Earth's motion due to inertia.

Question 18

Which of the following is an example of dynamic equilibrium?

Accepted Answer

A hockey puck sliding at constant speed on ice

Question 19

If two forces of $$12\ \mathrm{N}$$ and $$16\ \mathrm{N}$$ act at right angles to each other, what is the magnitude of the resultant force?

Accepted Answer

$$20\ \mathrm{N}$$

Question 20

Which of the following statements about support force is correct?

Accepted Answer

Support force is equal and opposite to the force of gravity for an object at rest on a surface.

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

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