Forces and geometry

Starting Force vs Rolling Force

Starting force is the peak effort needed to initiate motion, while rolling force describes effort after stable movement begins.

By HAION Engineering Knowledge TeamUpdated 2026-08-21Evidence: engineering-principle

DIRECT / 01

Quick answer

Starting force is the maximum horizontal force needed to begin moving stationary equipment. It is often higher than steady rolling force because wheel and floor deformation must recover, bearings and seals break away, and swivel casters may need to align with the travel direction.

Key facts

01
Breakaway, swivel and steady rolling force should be reported separately.
02
Dwell time and wheel flat-spot behavior can change the measured peak.
03
Handle height and operator direction affect equipment-level measurements.

VERIFIED PRODUCT CONTEXT

Physical caster reference

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HAION H391A single-wheel central-locking medical caster — HAION OFFICIAL PRODUCT IMAGESingle wheel central locking caster
H391A-3A100UPB(2FT) · Product data pending owner approval
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FORCE MODEL

Rolling resistance is not a single material value.

It is the measured response of the wheel, caster, load, alignment and floor at a defined operating condition.

Wheel geometry

Diameter, tread and deformation influence the contact response.

Load

The complete load path changes wheel and bearing behavior.

Floor

Joints, debris, texture and thresholds can dominate the route.

Alignment

Swivel orientation and wheel layout affect actual push force.

F_push = rolling + slope + acceleration + other route losses

Measure starting and steady force separately when the decision depends on both.

Why does the first movement feel harder?

At rest, the tread may deform under load and the wheel–floor contact patch settles. Seals and bearings must overcome static friction. If swivel casters face different directions, their contact patches scrub sideways while the forks rotate into alignment.

How should starting force be tested?

Define dwell time, load, floor, caster orientation, handle height and the rate at which force is applied. Record the force–time curve when possible. A single peak without test conditions is difficult to compare.

Design response

Reducing steady rolling resistance alone may not solve poor start-up ergonomics. Wheel diameter, tread resiliency, caster offset, swivel-bearing design and equipment geometry all deserve review.

Commercial reference

Need a manufacturer configuration?

Knowledge content remains independent of product selection. For available commercial solutions, continue to the official HAION website.

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