Question 1

According to Aristotle, what determines the rate at which an object falls to Earth?

Accepted Answer

Its mass and size

Question 2

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

Accepted Answer

An object resists changes in its motion and will continue moving at constant velocity unless acted upon by a force

Question 3

A ball is rolled down a frictionless ramp and then onto a horizontal surface. According to Galileo, what will happen to the ball's motion?

Accepted Answer

It will continue moving at a constant speed indefinitely

Question 4

Which experiment did Galileo use to challenge Aristotle's ideas about falling objects?

Accepted Answer

Dropping objects of different masses from the Leaning Tower of Pisa

Question 5

What is the value of acceleration due to gravity at Earth's surface, as measured by Galileo?

Accepted Answer

$$9.8 \, \mathrm{m/s^2$}$$

Question 6

Which of the following is a vector quantity?

Accepted Answer

Velocity

Question 7

A cart is pulled to the right with a force of $$15\,\mathrm{N}$$ and to the left with a force of $$20\,\mathrm{N}. $$What is the net force acting on the cart?

Accepted Answer

$$5\,\mathrm{N} to $$the left

Question 8

Which statement best describes the equilibrium rule in physics?

Accepted Answer

The sum of all forces acting on an object is zero: $$\sum \vec{F} = 0$$

Question 9

A book rests on a table. What force does the table exert on the book?

Accepted Answer

A support force (normal force) equal in magnitude and opposite in direction to the book's weight

Question 10

Which of the following scenarios is an example of dynamic equilibrium?

Accepted Answer

A hockey puck sliding at constant speed on frictionless ice

Question 11

If you push a crate at a steady speed in a straight line and the friction force is $$75\,\mathrm{N}$$, how much force must you apply?

Accepted Answer

$$75\,\mathrm{N}$$

Question 12

Why does a coin tossed straight up inside a moving train land back in your hand?

Accepted Answer

Because the coin retains the horizontal velocity of the train due to inertia

Question 13

Which of the following is NOT a property of inertia?

Accepted Answer

It causes objects to accelerate without a force

Question 14

Which of the following best explains why a bird can swoop down from a branch to catch a worm on a moving Earth?

Accepted Answer

Because the bird, branch, and worm all share the Earth's velocity due to inertia

Question 15

Which statement about the motion of falling objects did Galileo prove to be correct?

Accepted Answer

All objects fall at the same rate in the absence of air resistance, regardless of mass

Question 16

What is the difference between static and dynamic equilibrium?

Accepted Answer

Static equilibrium is when an object is at rest; dynamic equilibrium is when it moves at constant velocity

Question 17

Which of the following is a scalar quantity?

Accepted Answer

Mass

Question 18

If two bricks are dropped from different floors of a skyscraper at the same instant, what happens to the distance between them as they fall (neglecting air resistance)?

Accepted Answer

It remains the same

Question 19

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

Accepted Answer

An object at rest or in uniform motion will remain so unless acted upon by a nonzero net force

Question 20

Which equation correctly expresses the momentum of an object?

Accepted Answer

$$p = m v$$

Newton's First Law of Motion: Inertia and the Historical Development of Motion Concepts

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