1. Instantaneous Speed
Science 1206

2. Instantaneous Speed (Vinst):
Instantaneous Speed is the speed of an object at a particular moment in time.
How do we determine instantaneous speed?

3. With Constant Speed Example: What is Vinst at 3.0 s?
On the d-t graph, Vinst at 3.0 s = slope
On a v-t graph, Vinst is found by interpolating back to the y-axis.
In the case of CONSTANT SPEED, the slope at any point on the line is the same.

4. With Changing Speed Example: what is Vinst at 5.0 s?
On the d-t graph, a CURVED LINE, we determine Vinst by getting the slope of the tangent to the point.
On the v-t graph, Vinst is found by interpolating back to the y-axis.

5. What is a TANGENT? Tangent
A straight line that touches a curve at only one specific point.

6. How do we draw tangents?
Place your ruler on the curve at the specified point.
Swivel ruler around until it is an equal distance from the curve on both sides of the point.

7. Draw tangent.
Calculate the slope of the tangent.

8. HOMEWORK!!!
Complete Worksheets 12, 13, 14 on pages of your booklet!

16. Next stop  Unit 3 Test 1 Closed Book Test on Unit 3 Part 1Booklet
Topics include:
Significant Digits
Scientific Notation
Converting between Units
Rearranging Equations
Speed Calculations
Distance-Time Graphs
Instantaneous Speed
Test Format:
Multiple Choice
Graph Questions
TEST DATE :______________