Match the diagram conditions, then follow the example inputs and results. Change numerical values in the calculator.
1. Match the diagram to your question
中央の支点をはさんで、左の入力側と右の荷側に下向きの力がかかります。
a・bは支点から力の作用線までの垂直距離です。斜めのリンクの長さとは違います。
力を加える側の腕 a
200 mm
荷側の腕 b
50 mm
荷側の力 Fload
1,000 N
橙は左側に必要な入力の力です。腕が長い側ほど、同じモーメントを小さな力で出せます。
力を加える側に必要な力
250 N
理想の力の倍率 a/b
4
支点まわりの片側モーメント
50 N·m
Downward effort and load act on opposite sides of the fulcrum.
a and b are perpendicular distances to force lines, not diagonal link lengths.
Effort-side moment arm a
200 mm
Load-side moment arm b
50 mm
Load-side force Fload
1,000 N
Orange shows required effort on the left. A longer arm produces the same moment with less force.
Required effort force
250 N
Ideal force advantage a/b
4
Moment magnitude on each side
50 N·m
Blue marks inputs; orange marks outputs. These diagrams explain the fixed example below; dimensions and deformation are not drawn to physical scale.
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2. Example inputs
Effort-side moment arm aWhat goes here?
Use the dimension marked in the diagram. Distinguish radius from diameter, bore from outside diameter, and overall length from support span.
200 mm
Load-side moment arm bWhat goes here?
Use the dimension marked in the diagram. Distinguish radius from diameter, bore from outside diameter, and overall length from support span.
50 mm
Load-side force FloadWhat goes here?
Magnitude of a push or pull, in force units such as N, rather than mass in kg.
1,000 N
These are fixed teaching inputs. Coefficients, properties and comparison limits are not recommendations. Enter your conditions in the calculator.
3. Results for this example
Required effort force
250 N
Ideal force advantage a/b
4
Moment magnitude on each side
50 N·m
Moment arms are perpendicular distances to force lines. This example has downward forces on opposite sides of the fulcrum and finds effort for a 1,000 N load.
4. Which formula is used?
Feffort a = Fload b, MA = a/b, R = Fload + Feffort
Table units are not always the units required in the formula. The calculator converts selected units to its internal base units before computing.
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Assumptions and exclusions
Rigid static lever with downward forces on opposite sides of the pivot as illustrated. a and b are perpendicular distances from pivot to each force line. Self-weight, friction, member bending, pivot strength and deformation are excluded.
