Active Physics Vocab (Unit B, Describing Motion) (NOT FINISHED)

Active physics Vocab flash cards unit B, (Describing Motion), pd 3 - Stefanik

Reaction Time (Response Time)

The time inteval between stimulation and response

On average reaction time should be

150 and 300 milliseconds

Reaction

It takes the brain a short amount of time to respond

What reaction time is best?

A short reaction time

What are examples of things that increase reaction time?

Distractions, lack of sleep, being tired or sick, and drug/ alchoal use

Motion Diagram

Represents the motion of an object by displaying its position at various equally spaced times on the same diagram

Speed

The distance traveled per unit time. Speed is the answer to the question "how fast?"

Average Speed

Total distance traveled divided by time of travel

Instantaneous Speed

The speed at any given instant in time. A car's speedometer measures Instantaneous speed.

Volume=

Distance%Time

Distance=

Volume*Time

Time=

Distance%Volume

Accelerate

Rate at which velocity changes with time, in terms of both speed direction

What does it mean if the speed is changing

the object is accelerating

An object that is speeding up is acceleration but

In physics a object that is slowing down is also accelerating

what are spark timers are used for?

Measuring velocity, acceleration of falling or moving objects.

The timer makes that are separated by amounts of time _

Dots, equal, time

Call the time interval from one dot to the next a

"tick" and is 1/10s.

The the tape is pulled through the timer the the distance between the dots.

faster, larger

__ consist of a series of stop motion photos that track the distance and object moves during regular intervals of time.

Motion Diagrams

is how fast an object moving.

Speed

Average speed is equal to _____

Distance/ Time

If an object moves with constant speed, the bar graph will be

Even

If the height of the bars are changing, the object is

acceleration

Position v time graphs can tell us a lot about the motion of an object. If the line on a position vs time graph is _then the object is at rest

Horizontal

If the car is moving at constant speed, then the slope would be_

Constant

If the slope is ____ then the object is speeding up

increasing

If the slope changes from positive to negative it means that the object _

Turned around

What can Velocity v time graphs tell us

they can tell us a lot about the motion of an object, just like a position v time graph

On a velocity v time graph, a horizontal line means that the velocity is

Constant

If the velocity is _ the object is accelerating.

Changing

If the slope is constant, than the acceleration is

Constant

Acceleration

the rate of change of velocity. Speeding up, slowing down, and changing direction are all examples of _________

Constant Acceleration

Your speed will increase or decrease by the same amount every second.

5 m/s/s or 5m/s2 means that your speed by 5 m/s _

Changes/Every second

Acceleration=

final speed -initial speed/time

When an object changes is speed, it is _

Accelerating

Acceleration is equal to divided by

Change of speed/ Time

On a bar graph, if the bars get bigger by the same amount, the object has a _ acceleration

Constant

An inclined plane, who steepness does not change, will cause a car to roll down with _ acceleration

Constant