Motion in One Dimension. Motion in One Dimension. Movement along a straight-line path Linear motion Convenient to specify motion along the x and y coordinate system. Motion in One Dimension. Important to specify magnitude & direction of motion (Up or down; North, South, East, or West)
Important to specify magnitude & direction of motion (Up or down; North, South, East, or West)
- 2 miles
+ 10 miles
Quantity with both magnitude and direction
* Represented by arrows in diagrams
Average velocityis the displacement divided by the elapsed time.
The football player ran 50 m in 20 s. What is his average velocity?
v = 50 m / 20 s = 2.5 m/s
The World’s Fastest Jet-Engine Car
Andy Green in the car ThrustSSC set a world record of
341.1 m/s (762.8 mph) in 1997. To establish such a record, the driver makes two runs through the course, one in each direction, to nullify wind effects. From the data, determine the average velocity for each run.
Animation of constant acceleration website
Acceleration and Decreasing
Acceleration Animation Website
Animation - Direction of Acceleration and Velocity Website
1. Displacement x (meters)
2. Acceleration (constant) a (m/s2)
3. Final velocity v (m/s)
4. Initial velocity vo (m/s)
5. Elapsed time t (s)
** Find its displacement.
A spacecraft is traveling with a velocity of +3250 m/s. Suddenly the retrorockets are fired, and the spacecraft begins to slow down with an acceleration whose magnitude is 10.0 m/s2. What is the velocity of the spacecraft when the displacement of the craft is +215 km, relative to the point where the retrorockets began
A stone is dropped from the top of a tall building. After 3.00s of free fall, what is the displacement y of the stone?
The referee tosses the coin up
with an initial speed of 5.00m/s.
In the absence of air resistance,
how high does the coin go above
its point of release?