# Motion in One Dimension Test

### 29 terms by eostertag

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### Motion

the change of position in time

### Displacement

the directed change of an object's position

### Velocity

the time rate of change of displacement

### Acceleration

the time rate of change of velocity

### Objects that fall freely near the surface of the Earth...

are uniformly accelerated by gravity

### "Zero-time"

the time when we begin the event

### "Zero-position"

the specific place where we begin measuring

### Displacement in measured in...

units of length (such as meters or inches)

### In the graph in Section 2.2 (pg 15), the displacement of the object between times t1 and t2 is given by the relationship

d=d2-d1 (we are not primarily concerned about the exact path taken by the object between these points. We assume that the magnitude of the displacement is given by the length of a straight line between d1 and d2 along the axis representing position)

### Displacment is a ___quantity because

vector, because in addition to magnitude, it has direction.

distance

### When the displacement between two points of time (t1 and t2) is positive, that means

its magnitude is measured in the positive direction

### When the displacement between two points of time (t1 and t2) is negative, that means

the displacement is negative, and its magnitude is measured in the negative direction

t=t1-t2

### Average Velocity=

(slope) d/t (measured in units such as meters per second (m/s), or miles per hour (mph))

### What does average velocity indicate?

how rapidly the position of the object (d) has changed over the time interval (t)

### What type of quantity is velocity?

A vector quantity, because it has both magnitude and direction

Speed

### With velocity, we can use positive and negative signs to represent:

motion in opposite directions

### Instantaneous Velocity

the slope of a line drawn tangent to the graph at that point

Δv/t

### What does Δv/t represent?

acceleration, measured in units like meters/seconds^2 (m/s^2)

### When the slope of a velocity-time graph is straight,

the acceleration in this case is constant or uniform.

a=Δv/t

### Acceleration is a ____quantity because

vector, because it has both magnitude and direction.

### A positive acceleration means that

the velocity of an object is becoming more positive with time

### A negative acceleration means that

the velocity of the object is becoming more negative with time.

### Positive displacement

the object traveled the distance in the positive direction

### How to calculate displacement:

Find the area underneath the line in a velocity-time graph. (add the difference displacements for all sections underneath the graph)

Example: