Output force — Science definition

The force the machine applies to a load.

Where it is taught

In use

Mechanical advantage tells how a machine changes force: actual mechanical advantage = output force ÷ input force.

Mechanical Advantage

Questions using output force

Problem 1

A ratio and an absolute force answer different questionsA ratio and an absolute force answer different questionsMachine AEffort 25 N; output 100 NMA = 100/25 = 4Machine BEffort 40 N; output 120 NMA = 120/40 = 3A has greater force advantage; B supplies a greater absolute output force.Keep the test loads and task comparable before ranking performance.
In the supplied records, A multiplies effort force by four while B multiplies it by three. B’s output force is nonetheless larger because the input force also differs. The records distinguish ratio from total output and do not establish one machine as universally better. A fair test of the same task needs matched requirements and measurements of travel and energy.
For this unit’s illustrated case, which has greater mechanical advantage, and which has larger output force in the supplied records?
Answer and explanation

A has MA 4, greater than B’s MA 3. B has output 120 N, larger than A’s 100 N. These are different comparisons.

Actual mechanical advantage is measured output force divided by measured effort force. A high ratio cannot by itself establish high efficiency, faster work or suitability for a particular job.

A has MA 4, greater than B’s MA 3. B has output 120 N, larger than A’s 100 N. These are different comparisons.

Response criteria

  • Use the named labels, directions or supplied quantities accurately.
  • Connect the visual evidence to the scientific mechanism or calculation.
  • State the relevant model conditions or limitation.

Problem 2

Output force is 100 N and input force is 25 N. Find actual mechanical advantage.
Answer and explanation

4

100 ÷ 25 = 4.

Problem 3

A machine has mechanical advantage 2 and input force 18 N. Find output force.
Answer and explanation

36 N

2 × 18 = 36.

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