Acceleration and Velocity

Question 1

What is the difference between a scalar and a vector

Answer 1

A vector is a quantity with both magnitude and direction. A scalar is a number without any directon.

Question 2

List 4 Scalars

Answer 2

Volume, mass, time, and temperature

Question 3

Acceleration due to gravity

Answer 3

the acceleration of a freely falling object under the influence of earth’s gravity (9.8 m/s^2)

Question 4

average acceleration

Answer 4

An object’s change in velocity during some measurable time interval divided by the time interval

Question 5

List 4 vectors

Answer 5

Velocity, momentum, force, speed, and displacement

Question 6

free fall

Answer 6

the motion of an object due only to the effect of gravity

Question 7

What is the equation to find velocity?

Answer 7

d/t

Question 8

What are the equations used to solve for acceleration?

Answer 8

a = vf - vi / t

Question 9

instantaneous acceleration

Answer 9

change in an object’s velocity at an instant of time

Question 10

velocity time graph

Answer 10

velocity is plotted on the vertical axis and time is plotted on the horizontal axis

Question 11

What are the units used for velocity, distance, time and acceleration

Answer 11

Velocity: m/s
acceleration: m/s squared
time: seconds
distance: meters

Question 12

Displacement

Answer 12

a change in position

Question 13

Define position-time graph

Answer 13

In which the time data is plotted on the x-axis and the position data is plotted on the y-axis

Question 14

particle model

Answer 14

you replace the object or objects with single points

Question 15

Define average velocity

Answer 15

Average velocity is the ratio of an object’s change in position to the time interval during which the change occurred

Question 16

an object’s velocity is how fast it is moving and _____

Answer 16

in what direction it is moving

Question 17

the average speed is ___

Answer 17

the absolute value of the average velocity

Question 18

The rate at which an object’s velocity changes is its _____

Answer 18

acceleration

Question 19

The acceleration due to gravity on earth is _____

Answer 19

9.8m/s squared

Question 20

a series of points that depicts an object in motion is a ____

Answer 20

motion diagram

Question 21

Which of the following results in the largest acceleration?

Answer 21

A large change in velocity over a short time interval

Question 22

position time graph

Answer 22

a graph with time data on the x axis and position on the y axis

Question 23

What is the purpose of drawing a motion diagram?

Answer 23

A motion diagram represents the motion of an object by displaying its location at various equally spaced times on the same diagram and provide a visual aid to the problem for a better understanding

Question 25

Under what circumstances is it legitimate to
treat an object as a particle when solving
motion problems?

Answer 25

The object’s size must be less than the distance it moves. Or if the object’s internal motions are irrelevant.

Question 26

How are velocity and acceleration related?

Answer 26

Acceleration is the rate of change of velocity.

Question 27

If an object’s velocity-time graph is a
straight line parallel to the horizontal axis,
what can you conclude about the object’s
acceleration?

Answer 27

When the velocity-time graph is a line parallel to the horizontal axis the object’s acceleration is zero.

Question 28

absolute value

Answer 28

the magnitude of a real number

Question 29

What is the difference between average velocity and instantaneous velocity?

Answer 29

Average velocity is the ratio of an object’s change in position to the time interval during which the change occured. Instantaneous velocity is the speed and direction of an object at a particular instant.

Question 30

Explain the meaning if the velocity is above or below the x-axis

Answer 30

If the velocity is above the x-axis, it is negative but moving toward the origin. If it is below the velocity is still negative but moving away from the origin

Question 31

What do the lengths of velocity vectors mean?

Answer 31

The longer the vector, the faster the object. The closer the vectors are the slower, the further apart the faster.