Trial # Distance Traveled (m) Time ( ) Velocity ( ) Acceleration ( ) 1 0.30 .76

Question

Trial #

Distance Traveled

(m)

Time

(    )

Velocity

(    )

Acceleration

(    )

1

0.30

.76

.79

1.04

2

0.30

.74

.81

1.09

3

0.30

.71

.85

1.20

4

0.30

.68

.88

1.30

5

0.30

.72

.83

1.15

Average:

.72

.83

1.15

6

.60

1.22

.98

.80

7

.60

1.19

1.01

.85

8

.60

1.24

.97

.78

9

.60

1.17

1.03

.88

10

.60

1.27

.94

.74

Average:

1.22

.99

.81

11

.90

1.76

1.02

.60

12

.90

1.79

1.01

.56

13

.90

1.82

.99

.54

14

.90

1.85

.97

.53

15

.90

1.74

1.03

.59

Average:

1.79

1.00

.56

NOTE:   These distances are recommended. However, if you do not have a ramp long enough,

               you may replace these values with 0.30 m, 0.60 m, 0.90 m

I built a ramp with books and cardboard and put parks on the ramp at .30 m , .60m, and .90 m. The height, lengtt and angle of incline are listed abouve. I then held the marble at the top of the ramp and relased it while simataneouly starting the stopwatch timer. I timed the amount of time it took to get to the fist line 5 times, then the sencond line 5 times, then the third line 5 times. I then used time and distance to calculate velocity and velocity time and distance to calculate acceleration.

These are the absolutely minimum distances you can use.

Questions

Newton’s first law states that if no net force acts on an object, if at rest, the object will remain

at rest, and if in motion, it will continue moving at the same speed and in the same direction.

Does this experiment pertain to the First Law of Newton or not? Are there forces acting on the marble as it rolls down the incline? If so, which one(s)?

2)    Does the marble’s velocity vary as it rolls down the ramp? Take a look at your collected data to see if you notice a trend. If so, is this what you expected? Why, or why not?

3)    Does the marble’s acceleration vary as it rolls down the ramp? What is your data indicating? Is this what you expected? Explain.

4)    If you used a larger angle , what would you expect to happen to the marble’s acceleration? Explain. [Consider repeating the experiment with a steeper ramp.]

5)    When driving with a friend you set your sunglasses on the dashboard of his car right by the windshield in front of you. He says you shouldn’t do that because if he suddenly slams on his brakes it will fly back and hit you in the face. Does this make sense? Why or why not?

6)    Suppose you join a mission to Mars, where the acceleration of gravity is gMars = 3.71 m/s2.      How would you expect the results of your experiment to differ?

Trial #

Distance Traveled

(m)

Time

(    )

Velocity

(    )

Acceleration

(    )

1

0.30

.76

.79

1.04

2

0.30

.74

.81

1.09

3

0.30

.71

.85

1.20

4

0.30

.68

.88

1.30

5

0.30

.72

.83

1.15

Average:

.72

.83

1.15

6

.60

1.22

.98

.80

7

.60

1.19

1.01

.85

8

.60

1.24

.97

.78

9

.60

1.17

1.03

.88

10

.60

1.27

.94

.74

Average:

1.22

.99

.81

11

.90

1.76

1.02

.60

12

.90

1.79

1.01

.56

13

.90

1.82

.99

.54

14

.90

1.85

.97

.53

15

.90

1.74

1.03

.59

Average:

1.79

1.00

.56

Explanation / Answer

1. Yes the experiment pertains to first law of Newton. As the marble rolls down the incline there is a force of gravity that is acting on the marble and then there is the force of friction acting as well. A lot of other forces which might have negligible effect like air resistance acts on the marble.

2. Yes since the marble is under acceleration the velocity will vary. It can be seen from the data that the value for .9m is more than value for .3m. It is absolutely expected because of the presence of the acceleration.

3.The way you have calculated acceleration is slightly wrong. Acceleration is the rate of change of velocity. You can't simply find V/T for acceleration. It is delta V / delta T. Since there is only acceleration due to gravity so it will remain constant as it rolls down the ramp. Although the data indicates otherwise.

4.If a larger angle is used i.e a steeper ramp the acceleration of the marble will increase.

5.If the friend applies breaks suddenly the car will stop but due to inertia the sunglasses might hit the windshield and then may be come back but it won't fly back and hit you since it will move in the opposite direction when car is stopped suddenly.

6.Since the acceleration due to gravity has reduced the velocity will reduce at every point and so will the time.

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