Unit 1: Concepts Of Motion

Question 1

Motion

Answer 1

The change of an objects position with time

Question 2

Translational Motion

Answer 2

Motion in which the object moves through space

Question 3

Trajectory

Answer 3

The path along which an object moves

Question 4

Motion Diagram

Answer 4

Shows an objects position at several equally spaces instants of time

Question 5

Particle

Answer 5

An object that can be represented as a mass at a single point in space

Question 6

Particle Model

Answer 6

A simplification in which we treat a moving object as if all of its mass were concentrated at a single point

Question 7

Position Vector

Answer 7

An arrow that’s drawn from the origin to an objects position

Question 8

Scalar Quantity

Answer 8

A physical quantity described by a single number

Question 9

Vector Quantity

Answer 9

A quantity having both a size and a direction

Question 10

Magnitude

Answer 10

The size or length of a vector

Question 11

Displacement

Answer 11

A change of position

Question 12

Zero Vector

Answer 12

A vector with zero length

Question 13

Time Interval

Answer 13

A change in time

Question 14

Average Speed

Answer 14

Measures an objects fastness or slowness, defined as the ratio

Average Speed = Distance Travelled/Time Interval Spent Travelling = d/delta t

Question 15

Average Velocity

Answer 15

The ratio of how far and what direction an object travels over a time interval

Question 16

Average Acceleration

Answer 16

The ratio delta v/delta t

Question 17

How Velocity Can Change

Answer 17

1. The magnitude can change, indicating a change in speed
2. The direction can change, indicating the next changed direction

Question 18

Motion Along a Line

Answer 18

1. An object is speeding up if and only if v and a point in the same direction
2. An object is slowing down if and only if v and a point in opposite directions
3. An objects velocity is constant if and only if a = 0

Question 19

Features of a Coordinate Axis

Answer 19

1. An origin to define zero
2. An x or y label to indicate the positive end of the axis

Question 20

Position-Versus-Time Graph

Answer 20

A continuous line or curve showing an objects position as a function of time

Question 21

Speed and Vector Length

Answer 21

• An object is speeding up if it’s displacement vectors are increasing in length
• An object is slowing down if it’s displacement vectors are decreasing in length

Question 22

Pictorial Representation

Answer 22

A pictorial representation of a problem in physics

Question 23

Representation of Knowledge

Answer 23

Gives different perspectives on a problem

Question 24

Model, Visualize, Solve, Asess

Answer 24

A four-part problem solving strategy for solving physics problems

Question 25

SI Units

Answer 25

The system of units used in science

Question 26

Significant Figures

Answer 26

A digit that is reliably known

Question 27

Order-Of-Magnitude Estimate

Answer 27

A one-significant figure estimate or calculation