# Distance_ Speed and Acceleration by lifemate

VIEWS: 8 PAGES: 12

• pg 1
```									          Lab: Acceleration
Question: How is the speed of the car
changing?

Objectives:
1. Determine the rate of acceleration
through a calculation.
2. Determine the rate of acceleration using
a graph.
Background Information
is how an object’s
 Acceleration
VELOCITY changes over a period
of time.
Hypothesis
we graph Velocity vs. Time for
 If
a toy car, then we will be able to
calculate _____________.
Lab: Acceleration (continued)
Procedure:
1. Roll the car down the ramp and record the
three times: Time A (A light lit), Time B (B
light lit), and Time A to B (Both lights lit)
2. Calculate the speeds at A and B
speed A= 5cm/Time A
speed B = 5cm/Time B
3. Calculate the Acceleration
(Speed B – Speed A)/Time A to B
4. Move the photogates to a new position for trial
2 and repeat steps 1-3.
Graph
   Time is the independent variable, so
Time (in seconds) goes on the x axis.
   Speed is the dependent variable, so
Speed (cm/s) goes on the y axis.
   Your graph should have 4 points:
For trial 1: (time A, speed A) and (time B,
Speed B)
For trial 2: (time A, speed A) and (time B,
speed B)
Data
Trial 1     Trial 2
Time A
Time B
Time A to B
Speed A
Speed B
Acceleration
Analysis

1.   Is your graph a straight line or a
curve?
2.   What does the y-intercept of your
graph represent?
3.   Does the car accelerate as it moves
down the ramp? Justify your
Analysis continued

4. Calculate the acceleration of the car
by calculating the slope of the line.

5. Is the acceleration of the car
changing as it moves down the ramp?
Explain.
Analysis continued
6. When the car is speeding up, is tis
acceleration positive or negative? Support
Velocity vs. Time

2
Velocity (m/s)

1.5

1

0.5

0
0        2              4   6
Time (s)

7. A car traveling 1.6 m/s eventually
encounters a ramp (negligible friction).
Calculate the speed of the cart at t = 2.5 s.
Velocity vs. Time

2
Velocity (m/s)

1.5

1

0.5

0
0        2              4   6
Time (s)

8. Calculate the distance traveled by the cart
from t = 2.0 s to t= 3.5 s.
Reflection and Summary

In the first paragraph, summarize the
purpose and results of the lab.

In the second paragraph, tell me at least 5
things that you learned about speed and
acceleration.

```
To top