Physic Lab Report Parallel Force Essay

1411 Words Jul 23rd, 2012 6 Pages
Physics Lab Report: Parallel Force
Aim: To test the principle of moments.
Apparatus: Metre rule with holes drilled at the 25cm, 50cm and 75cm mark, 50g masses
50mm long bolt with a diameter of approximately 5mm, retort stand, boss head and clamp, 0-10 N spring balance, electronic pan balance ,wire or string for suspending masses from the metre rule, two bulldog clips.
Part A: Balancing a constant moment.
1. The experiment is set up by first placing the bolt through the rule, then the bolt is clamped with the boss-head. The rule must be ensured that it is balances horizontally before adding any weights.
2. The height of the pivot is adjusted so that when the rule is balanced the weights are a few centimeters above the
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2. A 100g mass is hung at a point on the rule so that the rule comes to rest in a horizontal position. The distance to the pivot of the 100g mass is recorded. 3. The position of the ruler’s centre of mass and all the forces acting on the rule is marked on the diagram. 4. The weight of the rule is calculated by using knowledge of moments. This value is recorded. 5. The 100g mass is removed and a spring balance is used to support the rule horizontally from its 30cm mark as shown.

6. All the forces acting on the rule are marked on the diagram. 7. The reading from the spring balance is used to calculate the weight of the rule. This value is recorded. 8. Tour apparatus is dismantle and the rule is measured on an electronic balance. This value is recorded.


| Mass of constant weight (g) | 100g | Weight of constant (N) | 1N | Distance from pivot of constant mass (m) | 0.25 |

F x r ( ) = F x r ( )
(0.98)(o.2) =F (0.25) F = 0.784 N Mass = 0.08 kg Mass = 80g | Weight shown from the spring balance (N) | 0.4 | Distance from pivot of constant mass(m) | 0.25m | Distance from pivot of mass (m) | 0.40m |

F x r ( ) = F x r ( )
(0.40)(0.45)= F(0.25) F = 0.72 N Mass = 0.073kg Mass=73.4g


1. The value difference between two reading is 6.6g. this is because the ruler was not horizontal due to the random

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