Understanding Science, Scientific Tools, Speed and Velocity, Position and Motion, and Acceleration Flashcards
Is the process of changing position.
Motion
Is the difference between the initial position and the final position of an object.
Displacement
Is the path taken
Distance
What does a description of a location include?
It usually states the location realitive to a certain point.
What does a COMPLETE description of your position include?
Distance, a direction, and a reference point.
The description of an object’s position depends on the what?
It depends on the reference point.
The reference direction is a what direction?
It is a positive direction.
The opposite direction is a what direction?
It is a negative direction.
What’s the definition of a reference point?
Is a starting point that can be used to locate place or thing.
When you are using two directions, you are using two whats?
You are using two dimensions.
To find a position in two dimensions you must do what?
Choose a reference point
Specify reference directions
Determine the distance along each reference direction
When can displacement and direction be equal.
It can only be equal if the motion is in one direction.
True or false?
Displacement is the distance an object moves along a path.
False. Displacement is the distance and direction of an object from its starting point.
True or False?
The description of an object’s position depends on the reference point.
True. Position is described by how far an object is from a reference point.
How did the description of your movement depend on the point at which you started?
The distance and the direction to a location can change if the reference point changes.
How does the description of an object’s position depend on a reference point?
An object’s position is its distance in a certain direction from a reference point.
Why is a reference point useful in describing positions of an object?
The reference point provides a starting from which all distances can be measured and compared.
How can you describe the position of an object in two dimensions?
It can be described by choosing a reference point and two reference directions then starting the distance along each reference direction.
What is the difference between distance and displacement?
Distance is the path taken. However, displacement is the difference between the initial position and the final position of an object.
The difference between the initial position and the final position of an object is its __________.
Displacement
Explain why a description of position depends on a reference point.
Position is the distance and direction f an object of a reference point. If the reference point changes, the distance and direction of the object from the reference point may change.
To describe a position in more than one dimension, you must use more than one: A. displacement. B. reference direction. C. reference point. D. type of motion.
B- reference direction
If you walk 2 km from your house to a store and then back home, what is your displacement?
The displacement is 0 km.
An airplane rolls down the runway. Compared to which reference point is the airplane in motion? A. the cargo the plane carries B. the control tower C. the pilot flying the plane D. the plane’s wing
B- control tower
Which describes motion in two dimensions? A. a car driving through a city B. a rock dropping off a cliff C. a sprinter on a 100-m track D. a train on a straight track
A- a car driving through a city
Which describes the greatest displacement?
A. walking 3 m east, then 3 m north, then 3 m west
B. walking 3 m east, then 3 m south, then 3 m east
C. walking 3 m north, then 3 m south, then 3 m north
D. walking 3 m north, then 3 m west, then 3 m south
B- walking 3 m east, then 3 m south, then 3 m east
Position relies on what three things?
Reference point, reference direction, and distance
Which pair of reference directions could be useful in describing a position in two dimensions and why? A. up and down B. left and right C. east and west D. west and north
D- west and north// because it can describe position in two dimensions
When is the displacement of an object the same as the distance that the object moves and why?
A. when the object moves in one direction only
B. when the object moves and then ends where it started
C. when the object moves halfway around a circle
D. when the object moves equal amounts in two directions
A- when the object moves in one direction only// displacement is the same as direction the motion is in one direction only.
It is a measure of the distance and object travels in a unit of time.
Speed
Is the rate of change of position in which the same distance is each second.
Constant speed
It is speed at a specific instant in time.
Instantaneous speed
It is the total distance traveled divided by the total time taken to travel that distance.
Average speed
It is the speed no direction of a moving object.
Velocity
When a car’s speed changes it moves a different what?
It moves a different distance each period of time.
Graphs that shows comparisons between distance and time are called what?
They are called distance-time graphs.
Constant speed is shown what on a distance-time graph.
It is shown as a straight line
You can use distance-time graphs to compare what?
The motion of two different objects.
On a graph the steeper the line indicates what?
It indicates a faster speed
You an use distance-time graphs to calculate the what?
The average speed of an object.
If the speed of an object changes instead of being constant, it’s motion on a distance-time graph is seen as what type of line?
It is seen as a curved line
It something is not constant you can calculate its average speed by what?
By choosing a starting point and an ending point.
The velocity of an object can be represented by what?
It can be represented by an arrow.