To reduce error in the experimental tests, all values
of l will be performed three times. This will improve accuracy
and highlight any errors in method, if there are any. The three values
will give some idea on the error bounds. Even if there is a draft in the
room, despite the room having shut windows and the door will be closed.
It would have a very small effect on a small heavy object like a ratchet
socket. Use of sellotape to secure paper and measuring apparatus on the
floor will verify consistent data on the experimental tests. The whole
structure will be supported by a rigid structure (clamp stand) to avoid
differing values of q and l. Three
people will perform the tests. One person to place the ratchet socket at
l, someone else to observe the ratchet socket as it hits the
paper on the floor, plus a third person to record results. If people we
to swap roles, it is possible that they would interpret what they do or
see differently from another person. Therefore the same person should
carry out their own task throughout the investigation. The slide and the
ruler(s) on the floor must be parallel with each other, otherwise d
will not be the true distance travelled horizontally. Lengths of l
will be marked on the side of the slide every 10cm with a marker pen.
This will clearly show the exact positioning of the ratchet before being
slid down the slide and avoid variation as the tests progress.
Angles will be measured using sine and length of
slide to the clamp stand and the height of the clamp stand to the slide.
arcsine 
= q
All measurements must be taken carefully otherwise
error could be multiplied when q is
calculated.
