PASCO ME-9502, Руководство пользователя, Страница: 18 / 94

S t a t i c s S y s t e m E x p . 2 : A d d i n g F o r c e s — R e s u l t a n t s a n d E q u i l i b r i a n t s
®
14
012-12876B
Procedure: Two Forces
1. Add or remove 0.5 g to the mass hanger. Did the force disk move away from the center position? How much
can you change the mass on the mass hanger without changing where the force disk is centered?
2. What are the magnitude and direction of F
g
, the gravitational force applied by the hanger, where F
g
= m g ?
• F
g
: Magnitude ________________ Direction ________________
3. Use the Spring Scale and Force Wheel to determine the magnitude and direction of F
E
, the equilibriant.
• F
E
: Magnitude ________________ Direction ________________
Procedure: Three Forces
1. Attach the Large Pulley and the two Small
Pulleys to the Statics Board and move the
Spring Scale as shown in the figure.
2. Attach threads to the bottom hook of the
Spring Scale and to mass hangers over the
Small Pulleys.
3. Add 30 g (0.030 kg) to the upper mass
hanger and add 50 g (0.050 kg) to the lower
mass hanger.
4. Adjust the Large Pulley and the Spring
Scale so that the force disk is centered in the
Force Wheel.
5. How much can you change the mass on the
hangers and still leave the force disk cen-
tered in the Force Wheel?
Data
Record the values of the hanging masses M
1
and
M
2
(including the mass of the mass hangers), the
magnitude in newtons of the forces F
1
, F
2
, and
F
E
, and the angles

1
,

2
, and

E
with respect to
the zero-degree line on the Force Wheel..
Mass (kg) Force (N) Angle (°)
M
1
F
1

1
M
2
F
2

2
F
E

E
Figure 2.3: Find the Equilibriant
Small
Pulley
Small
Pulley
Large
Pulley
Force
Wheel
Force
disk
Spring
Scale
F
1
F
2
F
E
Vector diagram

1

2

E
M
2
M
1
Zero
line on
the
Force
Wheel