Q: How do you force reduce to a couple?

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The force a lever can apply to a given point greatly depends on two distances:The distance from the pivot point to the object to be lifted and the distance from the pivot point to the point on the lever where force will be applied.To reduce the distance from the pivot-point to the point where Force is applied is to reduce the "force" of a lever.

A force machine does not reduce the amount of work that has to be done

Spring is a simple machine. When the driver takes the car in Des spring force to reduce the car's body.

There is no way to block gravity.

Moving up an incline requires extra energy to counter the force of gravity.

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Yes they do reduce the force of the waves. That's what makes it safe.

The force a lever can apply to a given point greatly depends on two distances:The distance from the pivot point to the object to be lifted and the distance from the pivot point to the point on the lever where force will be applied.To reduce the distance from the pivot-point to the point where Force is applied is to reduce the "force" of a lever.

A force machine does not reduce the amount of work that has to be done

Spring is a simple machine. When the driver takes the car in Des spring force to reduce the car's body.

There is no way to block gravity.

Moving up an incline requires extra energy to counter the force of gravity.

by increasing distance over which the force is applied

Two equal, but oppositely directed forces acting simultaneously on opposite sides of an axis of rotation. Since the translatory forces (forces that produce linear motion) cancel out each other, a force couple produces torque (rotatory forces) only. The magnitude of the force couple is the sum of the products of each force and its moment arm.

It has to do with impulsive force. F = (mv-mu)/t when you reduce the time of impact, you get a larger force. That is why the sudden stop of the hammer is to reduce time of impact, and increase force applied.

It has a resultant moment but does not have resultant force.

Extend the duration of the time of impact

The force must couple to the object. The point of application of the force must be able to move in the direction of the force.