1.
-Average speed is a measure of the distance traveled in a given period of time.
-Instantaneous Speed: the speed at any given instant in time
If you're looking the speedometer in the car it's instantaneous velocity.
2.
d=v*t d= 10m/s * 30s
d= 300 meters.
3.
-Definition: is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.
-Equation:
Ave. acceleration= velocity/time = vf-vi / tf-ti
-After 4 second he's going 28 m/s/s
Part II
1. -Whatever characteristics the velocity has, the slope will exhibit the same (and vice versa).
-The velocity would increase too.
2.
The slope equation says that the slope of a line is found by determining the amount of rise of the line between any two points divided by the amount of run of the line between the same two points. In other words,
- Pick two points on the line and determine their coordinates.
- Determine the difference in y-coordinates of these two points (rise).
- Determine the difference in x-coordinates for these two points (run).
- Divide the difference in y-coordinates by the difference in x-coordinates (rise/run or slope)
3.
-The principle is that the slope of the line on a velocity-time graph reveals useful information about the acceleration of the object.
-If the acceleration is zero, then the slope is zero (i.e., a horizontal line). If the acceleration is positive, then the slope is positive (i.e., an upward sloping line). If the acceleration is negative, then the slope is negative (i.e., a downward sloping line). This very principle can be extended to any conceivable motion.
Part III
1.
A free falling object is an object that is falling under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall. There are two important motion characteristics that are true of free-falling objects:
-Free-falling objects do not encounter air resistance.
-All free-falling objects (on Earth) accelerate downwards at a rate of 9.8 m/s/s (often approximated as 10 m/s/s for back-of-the-envelope calculations
