# A Review of Kinematics - PowerPoint PPT Presentation Download Presentation A Review of Kinematics

A Review of Kinematics Download Presentation ## A Review of Kinematics

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1. A Review of Kinematics SPH4U http://www.youtube.com/watch?v=9YUtFpLpGfk

2. Distance and Displacement For an object in motion, the distance travelled is the length of the path; the displacement is change in position.

3. Distance and Displacement For an object in motion, the distance travelled is the length of the path; the displacement is change in position. Displacement is a vector quantity: direction matters! Ex.

4. Vectors in Equations When substituting vector quantities into equations, direction is often indicated by a sign:

5. Vectors in Equations When substituting vector quantities into equations, direction is often indicated by a sign: If a question also contains [up] and [down], horizontal and vertical components are considered separately.

6. Speed and Velocity The rate at which an object is changing position is its velocity (also a vector quantity). Displacement Time interval Average velocity

7. Speed and Velocity The rate at which an object is changing position is its velocity (also a vector quantity). Initial velocity Final velocity

8. Speed and Velocity The rate at which an object is changing position is its velocity (also a vector quantity). (The units of velocity are m/s.)

9. Speed and Velocity The rate at which an object is changing position is its velocity (also a vector quantity). The magnitude of the instantaneous velocity is the object’s speed.

10. Acceleration The rate at which an object is changing velocity is the acceleration (also a vector quantity).

11. Acceleration The rate at which an object’s velocity is changing is the acceleration (also a vector quantity). (The units of acceleration of m/s/s or m/s2.)

12. Kinematics Equations These equations may be rearranged: Ex.

13. Kinematics Equations And they may be combined to derive other equations with different combinations of variables:

14. GUSS When problem solving, select the kinematics equation that contains your Givens and Unknown (and only these variables).

15. GUSS Example 1 How long does it take Usain Bolt to run 10.0 m, assuming he is starting from rest and is accelerating at 6.6 m/s2 [fwd]?

16. GUSS Example 1 How long does it take Usain Bolt to run 10.0 m, assuming he is starting from rest and is accelerating at 6.6 m/s2 [fwd]?

17. GUSS Example 1 How long does it take Usain Bolt to run 10.0 m, assuming he is starting from rest and is accelerating at 6.6 m/s2 [fwd]?

18. GUSS Example 2 For an object in free fall, How long will it take an Olympic diver with an initial velocity of 3.1 m/s [up] to hit the water 10.0 m below?

19. GUSS Example 2

20. GUSS Example 2

21. GUSS Example 2 Given: Using the quadratic formula: Or 1.8 s to 2 sig digs. Note that you want only the positive solution.