PASCO ME-9502, Руководство пользователя

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M o d e l N o . M E - 9 5 0 2 E x p . 1 6 : M o d i f i e d A t w o o d ’ s M a c h i n e
0 1 2 - 1 2 8 7 6 B 87
Data Table 1: Constant Total Mass
Part 2: Keep Net Force Constant
1. Put a 50-g mass on the ‘light’ (M
1
) mass hanger and put a 50-g mass and a 5-g mass on the ‘heavy’ (M
2
) mass
hanger.
2. Including each 5-g mass hanger, record the total mass for M
1
and the total mass for M
2
in the Data Table.
3. Pull the light mass hanger down so that the bottom edge of the heavy mass hanger is aligned with the starting
mark on the Statics Board.
• NOTE: Stop the hangers from spinning or swinging.
4. Release the light mass hanger and start timing at the same instant. Stop timing when the bottom edge of the
heavy mass hanger reaches the finish mark on the Statics Board. Record the time,
t
1
, in the Data Table. Repeat
the trial two more times and record the results.
5. For the second trial, add 20 g of mass to each hanger (but

M still is 5 g). Repeat the data recording procedure
three times.
6. For the third trial, add another 20 g of mass to each hanger and repeat the procedure three times.
7. For the fourth trial, add another 20 g of mass to each hanger and repeat the procedure three times.
8. For the fifth trial, add another 20 g of mass to each hanger and repeat the procedure three times.
Data Table 2: Constant Net Force
Calculations
1. Calculate and record the average time for each trial.
2. Calculate and record the theoretical acceleration and the measured acceleration for each trial.
Trial M
1
(kg) M
2
(kg)

M (kg)
t
1
t
2
t
3
t
avg
a
theoretical
a
measured
% diff.
1 0.001
2 0.002
3 0.003
4 0.004
5 0.005
Trial M
1
(kg) M
2
(kg)

M (kg)
t
1
t
2
t
3
t
avg
a
theoretical
a
measured
% diff.
1 0.005
2 0.005
3 0.005
4 0.005
5 0.005