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Science- Chapter 11 Sec 1
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Gravity
Terms in this set (30)
an object's change in position relative to a reference point
Motion
a system for specifying the precise location of objects in space and time
Frame of reference
When an object changes position with respect to a frame of reference, the object is in ______________________
motion
What can be used to describe the direction of an object's motion with a reference direction
north, south, east, west, up, or down
In addition to knowing direction, you need to know how far an object moves_____________________
to directly describe its motion
To measure the length of the path the object took
distance
The change in a position of an object is
displacement
is the distance traveled divided by the time interval during which the motion occurred
speed
is the speed of an object in a particular direction
Velocity
What does speed tell us about an object?
how fast an object moves
What does velocity tell us?
both the speed and direction that the object moves
What are the ways the direction of motion can be described?
- north, south, east, or west of a fixed point or
_an angle from a fixed line
If a body is moving in one direction, it has ______ velocity.
positive velocity
IF it is moving in the opposite direction, it has __________ velocity.
Negative velocity
What are common examples of positive velocity?
up and right
What are common examples of negative velocity?
Down and left
What determine resultant velocity?
combined velocities
What two quantities you must measure to calculate average speed?
the distance traveled and the time it took to travel that distance
What is the SI unit of speed?
m/s
What is the formula for speed and velocity?
speed = distance/time or v=d/t
If a train travels 300 miles in 2 hours, how fast was it going?
150 miles/hr (v=300/2)
If a train is going 200 miles/hour for 5 hours, how far will it travel?
1000 miles V=d/t; 200=d/5, 200*5=d
If a train is traveling 600 miles at a speed of 50 miles/hour, how long will it take for them to get to their location
12 hours; v=d/t; 50=600/t; 50*t=600; t=600/50
The shorter the time interval, __________________________ the measure of speed will be.
the more accurate
On a plot graph distance is shown on the _________________ axis?
Vertical
On a plot graph time is shown on the _________________ axis?
Horizontal
What can also be studied using a distance vs. time graph.
motion
On a plot graph the x-axis represents the ______________________?
independent variable
On a plot graph the y-axis represents the ______________________?
dependent variable
On a plot graph the slope of a distance vs. time graph equals ______________________?
speed
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