Chapter 4 - Linear Motion Flashcards
What is speed?
How fast an object is moving.
How do you find the average speed?
Total distance covered divided by the time interval.
What is instantaneous speed?
The speed something is traveling at any given moment.
What’s the difference between speed and velocity?
Speed is a description of how fast an object moves; velocity is how fast and in what direction it moves.
What is acceleration?
The rate at which the velocity of an object is changing.
What is free fall?
An object moving only under the influence of the gravitational force.
What is elapsed time?
The time that has passed since the beginning of any motion.
How do you calculate acceleration?
Divide the change in the velocity by the time interval over which the change happens.
What value do we use for gravitational acceleration?
10 m/s/s
On a distance versus time graph, the slope of the line represents what?
Speed.
On a velocity versus time graph, the slope of the line represents what?
Acceleration.
As time in free fall for an object continues, does the distance between successive seconds increase, decrease or stay the same?
Increase.
As time in free fall for an object continues, does the change in velocity between successive seconds increase, decrease or stay the same?
Stays the same.
If we graphed speed vs time for a freely falling object, what would the graph look like?
A diagonal line with a slope of 10 m/s/s
If two objects have the same mass but different surface areas, which is more likely to be affected by air resistance: the one with more surface area or the one with less?
Air resistance noticeably slows the motion of things with large surface areas.
