# PHY1Exam1.text

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1. Define Velocity?
How fast something is moving (its speed) and in what direction it is moving.
2. Define Acceleration?
Rate of change in velocity.
3. Define Displacement?
• The direction and distance of the shortest path between an initial and final position.
• The direction and length of the shortest path from the initial to the final position of an object’s motion.

• Δx = xf − xi
• Δx = displacement
• xf = final position
• xi = initial position
• Units: meters (m)
4. Define magnitude?
the magnitude − the amount − of the displacement.
5. Define Velocity?
• It is the measure of how fast and in which direction the motion is occurring.
• -represented by v.
• -Velocity has the dimensions of length divided by time; the units are meters per second (m/s).

• Δx = displacement
• Δt = elapsed time
• Units: meters/second (m/s)
6. How to calculate average velocity?
7. Define Average Velocity?
equals displacement divided by the time it takes for the displacement to occur.
8. Instantaneous Velocity?
Velocity at a specific moment.
9. Define Acceleration?
Acceleration measures the rate at which an object speeds up, slows down or changes direction. Any of these variations constitutes a change in velocity. The letter a represents acceleration.
10. Define Average Acceleration?
Average acceleration: The change in instantaneous velocity divided by the elapsed time.
11. Define Instantaneous Acceleration?
Instantaneous acceleration: Acceleration at a particular moment.
12. Define Free-fall acceleration?
Free-fall acceleration: Rate of acceleration due to the force of Earth's gravity.
 Author: iamsolo24 ID: 33072 Card Set: PHY1Exam1.text Updated: 2010-09-07 03:13:19 Tags: PHY Folders: Description: PHY1Exam1 Show Answers: