Lesson 1
the process of changing positions
Motion
a measure of the distance an object travels per unit of time
speed
Lesson 2: the total distance traveled divided by the total time taken to travel that distance
average speed
the measure of the change in velocity during a period of time
acceleration
After 2.0 s, Isabela was riding her bike at 3.0 m/s on a straight path. After 5.0 s, she was moving at 5.4 m/s. What was her acceleration?
Formula: (final speed- initial speed)/total time
0.8 m/s/s
the difference between the initial position and the final position of an object
displacement
What is the formula for finding the speed of an object in motion?
distance/time
Lesson 2: When might it be useful for a driver to know the average speed of the car? When might it be useful for the driver to know the instantaneous speed?
Average speed: to have an idea of how long it might take them to get to a destination
Instantaneous speed: to make sure they are traveling the speed limit.
When a car is slowing down, is it accelerating? Why or Why not.
Yes. Acceleration is a change in velocity. It is slowing down.
A train traveled 350 km in 2.5 h. What was the average speed of the train?
Formula: distance/time
140 km/hr
When are distance and displacement the same?
When an object moves in a straight line in one direction.
What is one way to increase the speed of an object, keeping in mind the definition of speed? Raise your hand for an answer.
An object's speed can increase by increasing the distance the object travels in the same time frame or by decreasing the time it takes for an object to travel the same time.
Lesson 2: How is constant speed shown on a distance time graph?
straight line
What are three ways an object can accelerate?
slow down, speed up, change direction
If you walk 2 km from your house to a store and then back home, what is your displacement?
0 km
What do you use to describe an object in two dimensions?
two directions
the rate of change of position in which the same distance is traveled each second
constant speed
Do you think distance and time could be represented on a circle graph? Why or Why not. Raise your hand to provide answer.
No circle graphs show percentages. Only line graphs show change over time.
What does a negative acceleration mean?
the object is slowing down or speeding up in the reverse direction
If you walk 3 km and back to the store and back, what distance did you travel?
6 km
What three things must be included when you describe a position?
reference point, reference direction, distance
the speed at a specific instant in time
instantaneous speed
the speed and direction of a moving object
velocity
Draw a speed time graph for an airplane that is landing.
Slanted downward
After 3.0 s, Mike was running at 1.2 m/s on a straight path. After 7.0 s, he was running at 2.0 m/s. What was his acceleration?
Formula: (final speed- initial speed)/ total time
0.2 m/s/s