Force Lab Instructions
1. Add 250g to the cart to bring its total mass to 0.500kg. Turn the brakes to keep the cart in
place until we¥ ready.
2. Drag the string to the hook on the right side of the cart. Attach a mass hanger and an extra
50g mass (total 100g) to the string.
3. When you¥ ready, activate the sensor and quickly release the brakes. You can deactivate the
sensor as soon as the cart reaches the far end of the track.
4. Copy the data to the clipboard and paste into Grapher. Determine the acceleration (slope of
vs. t is the easiest way). Note that the hanging mass and the cart move in tandem, so this
acceleration applies to both objects.
5. Sketch a free-body diagram for the hanging mass. Use Newtonà2nd Law to determine the
tension in the string from the known mass and the observed acceleration.
6. Sketch a free-body diagram for the cart. Use Newtonà2nd Law to determine the tension in
the string from the known mass and the observed acceleration.
7. Compare the tensions in #5 and #6 using percent difference.
8. Add 100g additional mass to the cart (total mass 0.600kg) and repeat the experiment.
9. Add 50g additional mass to the hanger (total mass 150g) and repeat the experiment.
10. Add a ¯cket Booster&orce of 0.5N to the cart that points to the left. Redo the free-body
diagram for the cart. Repeat the experiment. [Note: The new free-body diagram definitely
changes the calculation of the tension using the cartàmotion.]
11. Finally, change the angle of the track so that the cart must travel up a slope of 10(booster
still on!). [EDIT: Remove the xtra100g from the cart or the cart doesn accelerate uphillops!]. Take a screenshot of your set-up and paste it to the report. Redo the free-body diagram
for the cart. Repeat the experiment.
Force Lab Report
Mass of
cart (kg)
Hanging
Mass (kg)
Rocket
Booster
Force (N)
Angle
(deg)
0.500
0.600
0.600
0.600
0.500
0.100
0.100
0.150
0.150
0.150
0.00
0.00
0.00
-0.500
-0.500
0
0
0
0
10
Paste your plot of v vs. t (including the
fit) for the first case (500g cart; 100g
hangin)
Measured
acceleration
(m/s2)
FT from
falling
mass (N)
FT from
cart
mass
(N)
Percent
Difference
Paste your screenshot of the setup for
the final run.
Draw a free-body diagram for the falling mass. Use it and Newtonà2nd Law to derive an
equation for the tension in the string, FT
Draw a free-body diagram for the cart (without rocket boosters). Use it and Newtonà2nd Law
to derive an equation for the tension in the string, FT
Draw a free-body diagram for the cart, including the rocket booster. Use it and Newtonà2nd
Law to derive an equation for the tension in the string, FT
Draw a free-body diagram for the cart on an incline, including the rocket booster. Use it and
Newtonà2nd Law to derive an equation for the tension in the string, FT

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