1. Newton’s Second Law Pre-Lab
Modified Atwood’s Machine
What variables affect the acceleration of an object? A B D
Acceleration I
Net Force
Mass of cart (A)
System Mass I
Mass
Hanging mass (B)
Add paper to the end of the ramp until the system moves at a constant velocity.
Friction?
Angle of track? A B

2. 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.
Mass can be measured with the electronic balances around the room.
To measure the acceleration you must use LoggerPro and the motion detector to find the slope of the velocity vs. time graph.

3. Newton’s Second Law Pre-Lab Acceleration vs. Force with constant Mass
How can we change the force but keep the system mass constant? A B
To keep the mass constant, all mass must now stay either on the string or in the cart! Move 40. g = kg from the cart to the end of the string for the first trial.
Make sure the string stays parallel (horizontal) to the track.