Newton’s Second Law Pre-Lab Modified Atwood’s Machine What variables affect the acceleration of...
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Transcript of Newton’s Second Law Pre-Lab Modified Atwood’s Machine What variables affect the acceleration of...
Newton’s Second Law Pre-Lab
Modified Atwood’s Machine What variables affect the acceleration of an object?
Acceleration
Net Force
Hanging mass (B)
Mass of cart (A)Mass
Friction?
Angle of track?
A B
gAF
NF
gBF
gAN FF
gBF gmF BgB
The track is tilted so that the cart moves with constant velocity
when given a small push.
D
I
ISystem Mass
A
B
Newton’s Second Law Pre-Lab
Purpose: To create graphical and mathematical representations of the relationship between the acceleration, the net force, and the mass of a modified Atwood’s machine.
Newton’s Second Law
Mass can be measured with the electronic balances around the room.
To measure the acceleration you must use Data Studio and the motion detector to find the slope of the velocity vs. time graph.
Open the Data Studio file Newton’s Second Law.
Add the following masses to the cart.
Newton’s Second Law Pre-Lab
1 – black bar mass = kg
2 – 5 g masses = 0.010 kg
2 – 20 g masses = 0.040 kg
1 – 50 g mass = 0.050 kg
3 – 100 g masses = 0.300 kg
1 – 200 g mass = 0.200 kg
Total mass in cart = kg
Acceleration vs. Force with constant Mass
To keep the mass constant, all mass must now stay either on the string or in the cart!
Move 40. g = 0.040 kg from the cart to the end of the string for the first trial.
Don’t forget, the mass hanger adds 5 g = 0.005 kg to the hanging mass.
Newton’s Second Law Pre-Lab
How can we change the force but keep the system mass constant?
A
B
Acceleration vs. Force with constant Mass