Pasco Scientific ME-6956, Instruction Manual And Experiment Manual

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5
012-07558A PAScar Accessory Track Set (2.2m version)
The Friction Block is a wood rectangle that fits
neatly on top of the PAScar (ME-6950).
An eye screw is
provided so that you
may easily attach a
string to the block.
The exposed wood
on the top and one
side of the block
produces minimal
friction. Felt pads
attached to the
bottom surface and the other side provide more
friction. Mass can be placed on the top surface of
the Friction Block.
In experiments that use the
Friction Block, you will
investigate some of the
properties of sliding friction
- the force that resists the
sliding motion of two
objects when they are
already in motion.
Using the Friction Block
Magnetic bumpers
Plunger bar
Figure 6: Components of the PAScar (Model ME-6950)
Plunger release
spring
Bottom cover plate
Wheel/axle
assembly(includes
wheel bearings)
Suspension springs
Velcro tabs
Trigger bar
Plunger spring
Replacing the Wheel-Axle Assemblies
1. Using a Philips screwdriver, loosen the
screws and remove the bottom cover plate.
NOTE:
A #1 Phillips point screw driver is re-
quired for removing the thread-forming screws on
the bottom of the car.
3. Place the new wheel/axle assemblies over the
suspension springs.
4. Place the bottom plastic cover over the wheel/
axle assemblies, such that the vertical grooves
on the cover align over the axles. Align the
bottom cover flush with the frame.
2. With the car on a stable support, gently lift the
wheel assemblies from the frame.
NOTE:
Be sure to keep the components, such as
the spring, plunger, nuts and magnets in their
proper orientation (Figure 6). Rearranging or
moving these items could change the operational
capability of the PAScar.
NOTE:
When replacing the cover, be careful
not to knock the plunger release spring or the
plunger spring from their holding places. Re-
place the screws, and tighten them until the
cover snugly fits against the outside frame.
The top and bottom surfaces of the Friction Block
have a slot which allows a “picket fence” to be
inserted. (See the PASCO catalog.)
Thread-forming screws