Describing Postion
Vocabulary: the starting point you choose to describe the location, or position, of an object.
Reference Point
Vocabulary: the distance an object moves in a unit of time.
Speed
Vocabulary: the process of changing position
Motion
Vocabulary: the speed and the direction of a moving object.
Velocity
Vocabulary: a measure of how quickly the velocity of an object changes.
Acceleration
An object's ______________ describes its distance and direction from a reference point.
Position
An object that moves the same distance over a given unit of time is said to have __________ __________.
constance speed
What does GPS stand for?
Global Positioning System
When and object moves at the same speed and its direction does not change, it moves with __________ velocity.
constant
When a roller-coaster car travels downhill, it covers greater distance each second. The velocity __________.
increases.
The difference between the initial, or starting, position and the final position.
Displacement
When the distance an object covers increases or decreases over a given unit of time, the object is said to be ____________ ______________.
changing speed
How do speed and velocity differ?
Speed is the distance an object travels in a unit of time. Velocity includes both speed and the direction of travel.
What are two (2) ways in which the velocity of an object can change?
The object can change its speed or its direction.
Describe three (3) ways an object can accelerate.
The object can speed up, slow down, or change direction.
____________ is the length of the actual path followed.
Distance
What does speed describe?
Speed describes the distance an object travels in one unit of time.
The direction of the acceleration of an object on a(n) ____________ path is toward the __________ of the circle.
Identify the motion diagram that shows the greatest velocity. Why?
A. ---> ---> ---> --->
B. <--- <--- <--- <---
C. --------> ---------> -------->
C. it shows the fastest velocity because the arrows are the longest. A and B have the same sized arrows pointing in opposite directions. This means they have the same speed.
What is the difference between positive and negative acceleration?
Positive acceleration is an increase and negative acceleration is a decrease in the velocity of an object.
The word "reference" is from the Latin word "referre." What does the word "referre" mean?
"to carry or direct back"
What does this equation calculate?
Total distance
(m/s)=_______________
Total time
Average Speed
Suppose a car is traveling at 40 mph and goes around a curve without slowing down. Does the car's speed change as it goes around the curve? Explain.
No, the speed doesn't change because speed does not include direction.
Suppose a car is traveling 40 mph and goes around a curve without slowing down. Does the car's velocity change as it goes around the curve? Explain.
Yes, the velocity changes because velocity includes direction.
Does acceleration refer only to an increase in velocity?Explain.
No; acceleration can mean a decrease in velocity or a change in direction.