Question 1

Explain the relationship between velocity and acceleration.

Accepted Answer

Acceleration is the time rate of change of velocity.

Question 2

Jane swims the length of a 40. meter pool in 10. seconds and immediately swims back to the starting position in another 15. seconds. What was her average velocity?

Accepted Answer

Zero

Question 3

Discuss the differences between distance and displacement.

Accepted Answer

Distance is the total path length traversed in moving from one location to another. Displacement is the straight-line distance between two points, along with the direction from the starting point to the final point.

Question 4

Explain how a POSITIVE acceleration could produce a DECELERATION.

Accepted Answer

The answer of Explain how a POSITIVE acceleration could produce...

Question 5

Discuss whether a car speedometer measures instantaneous speed or an average speed.

Accepted Answer

The answer of Discuss whether a car speedometer measures instantaneous...

Question 6

In the formula v² = v_o² + 2 a x, what does x represent?

Accepted Answer

The answer of In the formula v² = v_o² +...

Question 7

An object moving under the influence of only gravity is said to be in ________ ________.

Accepted Answer

The answer of An object moving under the influence of...

Question 8

Contrast Aristotle's predictions concerning free-falling bodies with Galileo's predictions.

Accepted Answer

The answer of Contrast Aristotle's predictions concerning free-falling bodies with...

Question 9

Consider a heavy object which is thrown straight up, reaches its highest point, and then falls back down to the ground. During what parts of the trajectory was it in "FREE FALL"? (assume here that air friction is negligible)

Accepted Answer

The answer of Consider a heavy object which is thrown...

Question 10

"Big Mike" throws a baseball straight up and it eventually falls back to him. When the ball was at its highest point, what was its velocity and what was its acceleration? (remember to include magnitude and direction)

Accepted Answer

The answer of "Big Mike" throws a baseball straight up...

Question 11

A scalar quantity is described by both a magnitude and a direction.

Accepted Answer

A scalar quantity is described only by magnitude, not direction.

Question 12

A vector quantity is described by both a magnitude and a direction.

Accepted Answer

A vector quantity is defined by having both magnitude (size or numerical value) and direction, distinguishing it from a scalar quantity, which has only magnitude.

Question 13

Is it possible for the magnitude of displacement to be greater than the distance traveled.

Accepted Answer

Displacement is the shortest distance between the initial and final positions of an object, often represented by a straight line in a specific direction, whereas distance is the total path length traveled by the object. Therefore, displacement can never be greater than the distance traveled.

Question 14

Speed indicates how fast something is moving and in which direction it is moving.

Accepted Answer

Speed indicates how fast something is moving but does not specify the direction; velocity specifies both speed and direction.

Question 15

It is possible to have constant speed, but still be accelerating.

Accepted Answer

Acceleration involves a change in velocity, which includes both speed and direction. Therefore, an object moving at constant speed but changing its direction is still accelerating.

Question 16

A negative velocity, approaching zero, represents a negative acceleration.

Accepted Answer

A negative velocity approaching zero indicates the object is slowing down in the negative direction, but it doesn't necessarily mean the acceleration is negative; acceleration depends on the change in velocity over time, not just the sign of the velocity.

Question 17

The "acceleration of gravity" is 9.8 m/s² everywhere on the surface of the Earth.

Accepted Answer

The acceleration due to gravity varies slightly over the surface of the Earth, generally between about 9.78 m/s^2 and 9.83 m/s^2, due to factors like altitude and Earth's rotation.

Question 18

An object released from rest experiences free fall.

Accepted Answer

In free fall, an object is only acted upon by gravity, with no resistance from air or other forces, starting its motion from rest.

Question 19

The acceleration due to gravity has the same value for all free-falling objects, regardless of their mass or weight.

Accepted Answer

This is because the acceleration due to gravity is a constant value (approximately 9.81 m/s^2 on the surface of the Earth) that depends only on the location (e.g., altitude, latitude) and not on the mass or weight of the falling object.

Question 20

All of the following are scalars, except
A) time.
B) force.
C) temperature.
D) distance.
E) mass.

Accepted Answer

Force is a vector quantity because it has both magnitude and direction. Scalars only have magnitude.

Quiz 2: Kinematics: Description of Motion

Explain the relationship between velocity and acceleration.

Jane swims the length of a 40. meter pool in 10. seconds and immediately swims back to the starting position in another 15. seconds. What was her average velocity?

Discuss the differences between distance and displacement.

Explain how a POSITIVE acceleration could produce a DECELERATION.

Discuss whether a car speedometer measures instantaneous speed or an average speed.

In the formula v² = v_o² + 2 a x, what does x represent?

An object moving under the influence of only gravity is said to be in .

Contrast Aristotle's predictions concerning free-falling bodies with Galileo's predictions.

Consider a heavy object which is thrown straight up, reaches its highest point, and then falls back down to the ground. During what parts of the trajectory was it in "FREE FALL"? (assume here that air friction is negligible)

"Big Mike" throws a baseball straight up and it eventually falls back to him. When the ball was at its highest point, what was its velocity and what was its acceleration? (remember to include magnitude and direction)

A scalar quantity is described by both a magnitude and a direction.

A vector quantity is described by both a magnitude and a direction.

Is it possible for the magnitude of displacement to be greater than the distance traveled.

Speed indicates how fast something is moving and in which direction it is moving.

It is possible to have constant speed, but still be accelerating.

A negative velocity, approaching zero, represents a negative acceleration.

The "acceleration of gravity" is 9.8 m/s² everywhere on the surface of the Earth.

An object released from rest experiences free fall.

The acceleration due to gravity has the same value for all free-falling objects, regardless of their mass or weight.

All of the following are scalars, except

Quiz 2: Kinematics: Description of Motion

Explain the relationship between velocity and acceleration.

Jane swims the length of a 40. meter pool in 10. seconds and immediately swims back to the starting position in another 15. seconds. What was her average velocity?

Discuss the differences between distance and displacement.

Explain how a POSITIVE acceleration could produce a DECELERATION.

Discuss whether a car speedometer measures instantaneous speed or an average speed.

In the formula v2 = vo2 + 2 a x, what does x represent?

An object moving under the influence of only gravity is said to be in ________ ________.

Contrast Aristotle's predictions concerning free-falling bodies with Galileo's predictions.

Consider a heavy object which is thrown straight up, reaches its highest point, and then falls back down to the ground. During what parts of the trajectory was it in "FREE FALL"? (assume here that air friction is negligible)

"Big Mike" throws a baseball straight up and it eventually falls back to him. When the ball was at its highest point, what was its velocity and what was its acceleration? (remember to include magnitude and direction)

A scalar quantity is described by both a magnitude and a direction.

A vector quantity is described by both a magnitude and a direction.

Is it possible for the magnitude of displacement to be greater than the distance traveled.

Speed indicates how fast something is moving and in which direction it is moving.

It is possible to have constant speed, but still be accelerating.

A negative velocity, approaching zero, represents a negative acceleration.

The "acceleration of gravity" is 9.8 m/s2 everywhere on the surface of the Earth.

An object released from rest experiences free fall.

The acceleration due to gravity has the same value for all free-falling objects, regardless of their mass or weight.

All of the following are scalars, except

In the formula v² = v_o² + 2 a x, what does x represent?

An object moving under the influence of only gravity is said to be in .

The "acceleration of gravity" is 9.8 m/s² everywhere on the surface of the Earth.