1. Wednesday video clip day
Monday February 27, Day 2
1. Please have these
Items on your desk.
Science
Notebook
Agenda
Science Starters
Sheet
Science Starter:
Wednesday video clip day
Worksheets
Lab
Write Up
Under the document camera

2. Update table of contents
Page Date Activity
/ How to calculate speed &
acceleration.

3. http://www.youtube.com/watch?v=jDy- GpByrnU
Eureka video clip for acceleration.

4. How to Calculate Speed and Acceleration

5. Speed
Speed- the distance traveled divided by the time during which the motion occurred.
Constant Speed- movement at a fixed distance per unit of time.
The same amount of distance is covered by the object in the same amount of time at each measurement of that same interval.
Instantaneous Speed-is the velocity of an object at a certain time.
For example:- Suppose you are driving in a car with your father see the speedometer, its speed constantly varies, Because speedometer give speed at a particular moment of time.

6. Formulas
How to calculate it
Distance
Time

7. Variables Expressed by
Distance can be expressed in
km (kilometers), mi (miles), m (meters), ft (feet).
Time can be expressed in
Hours, minutes, seconds, days.
Speed can be expressed in
m/s (meters per second), cm/s (centimeters per second), km/ hr (Kilometers per hour).

8. Determine which one is whichA T S

9. Calculate it ____ ____ ____ ____ D D T S Given Work Answer
D= 20 laps * .5 miles D=
10 miles
D= 10 miles
S = D/T T=
2 hours
S= 10 miles / 2 Hours S= ?
5 MPH

10. Calculate it T D _____ __ __ __________ D T Given Work Answer
S= 30 Meters/ 20 minutes D= ?
S= 1.5 MPM
D= S*T T=
60 minutes
D= 1.5 MPM * 60 Minutes S=
1.5 MPM
D= 90 meters

11. Calculate it _____ _____ _____ _____ T D T D Given Work Answer
S= 3 Blocks/ 5 Minutes D=
15 Blocks T= ?
S= .6 bpm S=
.6 bpm
T= D/S
T= 15 Blocks/ .6 bpm
25 minutes

12. Acceleration
Acceleration- the rate at which velocity changes over time.
An object accelerates if it changes speed or direction.

13. Acceleration Formula Acceleration = Final speed- Starting speed
Time it takes to change speed

14. Calculating Acceleration
A roller coaster’s velocity is 20 m/s N at the top of a hill, then 4 seconds later, at the bottom of the hill, the velocity is 35 m/s S. What is the acceleration of the roller coaster?
Time-4 seconds
FS-35 m/s
SS-20 m/s
Acceleration= FS – SS = m/s-20 m/s = 15m/s
Time sec s
A= 3.75 m/s²