Key Terms
Define "Reference Point"
It is a fixed point from which we measure the positions of a moving object.
The steeper the graph, the ____ the motion.
The steeper the graph, the faster the motion.
A car travels at uniform velocity a distance of 100 m in 4 seconds. What is the velocity of the car?
25 m/s
Time is always plotted on the ____ axis.
Time is always plotted on the X-axis.
Speed = Distance /___
Speed = Distance / Time
Define "Trajectory"
It is the path taken by the moving object.
A horizontal line means the object is ____ ____. It is stationary.
A horizontal line means the object is not moving. It is stationary.
If a sprinter runs 100 m in 10 seconds, what is his average velocity?
10 m/s
How do you represent a stationary object (an object that is not moving) on a graph?
With a horizontal line.
Distance / Speed =____
Distance / Speed = Time
Define "Displacement"
It is the straight line that goes from the starting point to the ending point.
A curved line means the speed is changing by _____ or ______.
A curved line means the speed is changing by speeding up or slowing down.
A boy walks at a speed of 4 km/h. How much time does he take to walk a distance of 20 km?
5 hours
What can be determined from the slope of a distance-time graph?
Speed
Velocity is represented by an arrow, which is called a ___.
Velocity is represented by an arrow, which is called a vector.
Define "Distance Traveled"
It is the length of the trajectory.
An object is in ___ when its distance from a(n) ____ is changing.
An object is in motion when its distance from a(n) reference point is changing.
A cyclist covers a distance of 30km in 2 hours. Calculate his speed.
15 km/h
Distance is placed on the ___-axis in a distance-time graph.
Distance is placed on the Y-axis in a distance-time graph.
What’s the meaning of a negative speed?
A negative speed indicates that the moving object is moving backwards.
Define "Acceleration"
Acceleration is the change of speed over time.
Speed in a given direction is ____.
Speed in a given direction is velocity.
A car traveling north covers a distance of 400 km in 4 hours. Calculate his velocity.
100 km/h to the north
Is it possible to have a vertical line on a distance-time graph?
No.
What is the difference between "trajectory" and "displacement?
Displacement is the straight line that goes from the initial point to the final point, whereas trajectory is the real path of the moving object.