22 Stability & Load Handling Practice Questions & Answers

1. 1. On a sit-down counterbalanced forklift, the three points that form the 'stability triangle' are:

   • A.The four corners of the truck chassis
   • B.The two front (drive) wheels and the center (pivot) point of the steer axle✓ Answer
   • C.The operator's seat and the two rear wheels
   • D.The two forks and the mast

   A counterbalanced truck has three-point suspension: the two front wheels plus the pivot point at the center of the steer (rear) axle. Connecting these points forms the stability triangle; the truck stays upright only while the combined center of gravity stays inside it.

   Source: OSHA 1910.178 App A — Stability triangle / three-point suspensionReport a problem with this question

2. 2. A forklift will remain stable (not tip over) as long as the combined center of gravity of the truck and load stays:

   • A.Inside the boundaries of the stability triangle✓ Answer
   • B.Directly above the front axle
   • C.Behind the counterweight
   • D.As high as possible for balance

   Stability depends on the combined center of gravity staying within the stability triangle. If it moves outside the triangle — forward, sideways, or diagonally past a line between the wheels — the truck tips in that direction.

   Source: OSHA 1910.178 App A — Line of action must fall within stability triangleReport a problem with this question

3. 3. The 'load center' printed on a forklift data plate means:

   • A.The maximum height the load can be raised
   • B.The total weight the counterweight can offset
   • C.The horizontal distance from the face of the forks to the load's center of gravity✓ Answer
   • D.The distance between the two fork tips

   Load center is the horizontal distance from the vertical face of the forks to the load's center of gravity. Rated capacity is stated at a specific load center (commonly 24 inches) because a load whose center is farther out creates more forward tipping moment.

   Source: OSHA 1910.178 App A — Definition of load center (24 in. standard)Report a problem with this question

4. 4. If a load's center of gravity is farther from the forks than the load center stamped on the data plate, the truck's safe capacity for that load is:

   • A.Unchanged — load center does not affect capacity
   • B.Doubled, because the load is spread out
   • C.Increased — it can safely lift more
   • D.Reduced — it can safely lift less than the rated capacity✓ Answer

   A center of gravity farther from the forks increases the load's leverage (moment) about the front wheels, so the truck's safe capacity drops. Rated capacity is only valid at or within the marked load center distance.

   Source: OSHA 1910.178 App A — Load center / moment principleReport a problem with this question

5. 5. Under OSHA 1910.178(o)(2), a forklift operator may handle:

   • A.Only loads within the rated capacity of the truck✓ Answer
   • B.Overloaded loads if driven slowly
   • C.Loads up to twice the rated capacity for short distances
   • D.Any load that fits on the forks

   OSHA 1910.178(o)(2) states only loads within the rated capacity shall be handled. Exceeding rated capacity moves the combined center of gravity forward and can lift the rear wheels, causing a forward tip-over.

   Source: OSHA 1910.178(o)(2)Report a problem with this question

6. 6. When traveling with a load, OSHA and stability principles require the operator to:

   • A.Keep the load raised high for visibility
   • B.Tilt the mast fully forward
   • C.Carry the load with the forks level and high
   • D.Keep the load low and the mast tilted back✓ Answer

   Carrying the load low and tilted back keeps the combined center of gravity low and rearward, well inside the stability triangle. Raising or forward-tilting the load shifts the center of gravity up and forward, reducing stability.

   Source: OSHA 1910.178 App A; 1910.178(n)(7)(iii)Report a problem with this question

7. 7. Raising a load high on the mast affects stability by:

   • A.Raising the combined center of gravity, making the truck easier to tip✓ Answer
   • B.Having no effect as long as capacity is not exceeded
   • C.Lowering the center of gravity and improving stability
   • D.Shifting weight onto the counterweight for more grip

   Raising a load lifts the combined center of gravity higher. A higher center of gravity is more easily pushed outside the stability triangle by turns, slopes, or uneven floors, so the truck tips more readily — especially sideways.

   Source: OSHA 1910.178 App A — Elevation raises center of gravityReport a problem with this question

8. 8. The purpose of the counterweight built into a counterbalanced forklift is to:

   • A.Add traction to the front wheels only
   • B.Allow the truck to lift without a data plate
   • C.Increase the maximum travel speed
   • D.Offset the weight of the load and resist forward tip-over✓ Answer

   The counterweight, built into the rear of the truck, offsets the load's weight and maximizes resistance to tipping forward. It acts on the opposite side of the front-wheel fulcrum, balancing the load's forward moment.

   Source: OSHA 1910.178 App A — Counterweight definitionReport a problem with this question

9. 9. On a counterbalanced forklift, the front wheels (the load side) act as the:

   • A.Counterweight
   • B.Steering axle
   • C.Fulcrum around which the load and counterweight balance✓ Answer
   • D.Center of gravity

   The front axle is the fulcrum of a seesaw: the load ahead of it creates a forward tipping moment, and the truck body plus counterweight behind it creates a counter-moment. Overloading makes the load's moment exceed the counter-moment, tipping the truck forward.

   Source: OSHA 1910.178 App A — Moment / fulcrum principleReport a problem with this question

10. 10. 'Moment' in forklift stability is defined as:

    • A.The time it takes to raise a load
    • B.Weight multiplied by the distance from a pivot point✓ Answer
    • C.The speed of the truck when turning
    • D.The total height of the mast

    Moment equals weight times distance from the pivot. The truck stays stable when its resisting moment (counterweight × distance) is at least equal to the load moment (load weight × load center). This is why a heavier load or a longer load center reduces safe capacity.

    Source: OSHA 1910.178 App A — Definition of momentReport a problem with this question

11. 11. Before picking up a load, the forks should be:

    • A.Spread and inserted fully under the load✓ Answer
    • B.Placed only under the front edge of the load
    • C.Kept as narrow as possible together
    • D.Tilted fully forward and left short of the load

    Forks should be spread as wide as the load allows and inserted fully so the load rests against the fork backrest. This puts the load's weight close to the front wheels (short load center) and prevents the load from tipping off, maximizing stability and capacity.

    Source: OSHA 1910.178(o)(1) — stable/safely arranged loads; App A load centerReport a problem with this question

12. 12. Under OSHA 1910.178(a)(6), the data (capacity) plate on a forklift must be:

    • A.Replaced with the operator's own estimate
    • B.Removed once the operator memorizes it
    • C.Optional if the truck is under 10 years old
    • D.In place and maintained legible✓ Answer

    OSHA 1910.178(a)(6) requires that all nameplates and markings be in place and maintained legible. The plate tells the operator the truck's rated capacity at a given load center and mast height — the information needed to avoid overloading.

    Source: OSHA 1910.178(a)(6)Report a problem with this question

13. 13. An operator wants to add an attachment (e.g., a clamp) to a forklift. Under OSHA 1910.178(a)(4), this is:

    • A.Allowed if the operator reduces speed
    • B.Never allowed under any circumstances
    • C.Allowed anytime as long as it fits
    • D.Only allowed with the manufacturer's prior written approval, and the capacity plate must be updated✓ Answer

    OSHA 1910.178(a)(4) prohibits modifications affecting capacity or safe operation without the manufacturer's prior written approval, and requires the capacity plate to be changed accordingly. An attachment adds weight and moves the center of gravity, changing rated capacity.

    Source: OSHA 1910.178(a)(4)Report a problem with this question

14. 14. Why does an overloaded forklift tend to tip forward?

    • A.The mast becomes lighter than the load
    • B.The steering axle locks up
    • C.The load's moment exceeds the counterweight's moment, pushing the combined center of gravity ahead of the front axle✓ Answer
    • D.The rear wheels become too heavy

    When the load is too heavy (or too far out), its forward moment about the front axle exceeds the counterweight's moment. The combined center of gravity crosses ahead of the front wheels, the rear wheels lift, and the truck pitches forward.

    Source: OSHA 1910.178 App A — Longitudinal stability / momentReport a problem with this question

15. 15. Sideways (lateral) tip-over is most likely to happen when an operator:

    • A.Backs slowly down a ramp
    • B.Sets the load flat on the floor
    • C.Drives straight ahead with the load low
    • D.Turns sharply while traveling fast with a raised load✓ Answer

    A fast, sharp turn creates centrifugal force that pushes the combined center of gravity sideways toward a leg of the stability triangle; a raised load makes the center of gravity higher and the effect stronger, so the truck can tip over sideways.

    Source: OSHA 1910.178 App A — Lateral stability / dynamic forcesReport a problem with this question

16. 16. The combined center of gravity of a loaded forklift is BEST described as:

    • A.The same as the load center distance
    • B.A fixed point that never moves
    • C.Located only in the counterweight
    • D.A single balance point of the truck-and-load together that moves as the load changes✓ Answer

    When a load is added, the truck's center of gravity and the load's center of gravity combine into one point. This combined center of gravity shifts forward, up, or sideways as the load is added, raised, or the truck turns — and it must stay inside the stability triangle.

    Source: OSHA 1910.178 App A — Combined center of gravityReport a problem with this question

17. 17. A forklift is rated 4,000 lb at a 24-inch load center. A uniform load whose center of gravity is 36 inches from the fork face should be treated as:

    • A.An increase in safe capacity
    • B.Irrelevant to capacity
    • C.Reducing the safe capacity below 4,000 lb because the load center is greater than 24 inches✓ Answer
    • D.Still a full 4,000 lb because weight is unchanged

    Rated capacity is stated at a specific load center (24 in.). A load center of 36 in. lengthens the moment arm, so the truck's safe capacity for that load is less than 4,000 lb. The operator must use the manufacturer's derating chart, not the plate's headline number.

    Source: OSHA 1910.178 App A — Load center effect on rated capacityReport a problem with this question

18. 18. An uneven or off-center load on the forks should be handled by:

    • A.Carrying it high so it does not shift
    • B.Speeding up so it settles
    • C.Centering and securing it so its weight is balanced between the forks✓ Answer
    • D.Placing all the weight on one fork

    OSHA 1910.178(o)(1) requires loads to be stable and safely arranged. Centering and securing an uneven load keeps the combined center of gravity centered within the stability triangle; an off-center load shifts it toward one side, risking a sideways tip.

    Source: OSHA 1910.178(o)(1)Report a problem with this question

19. 19. When driving without a load, a counterbalanced forklift's center of gravity is:

    • A.Not present until a load is added
    • B.In the same place as when loaded
    • C.Ahead of the front wheels
    • D.Farther back, so the truck is more stable against forward tip but the rear can feel light in turns✓ Answer

    Empty, the center of gravity sits back near the counterweight, so forward tip-over is unlikely — but because the rear (steer) wheels carry less relative weight in a turn, an unloaded truck can actually be more prone to a sideways tip when turning fast.

    Source: OSHA 1910.178 App A — Center of gravity position (loaded vs. unloaded)Report a problem with this question

20. 20. Tilting the mast forward while a load is raised high is dangerous because it:

    • A.Increases the counterweight's effect
    • B.Locks the load onto the forks
    • C.Moves the combined center of gravity forward and can push it outside the stability triangle✓ Answer
    • D.Lowers the center of gravity

    Forward tilt moves the load — and the combined center of gravity — toward and past the front wheels. With the load already raised (high center of gravity), even a small forward shift can carry the center of gravity outside the triangle and tip the truck forward.

    Source: OSHA 1910.178 App A — Forward tilt effect on center of gravityReport a problem with this question

21. 21. According to stability principles, the vehicle stays upright as long as the truck's stabilizing moment is:

    • A.Less than the load's tipping moment
    • B.Equal to or greater than the load's tipping moment✓ Answer
    • C.Independent of the load weight
    • D.Zero

    For stability the truck's resisting moment (counterweight and truck weight × their distance from the front axle) must be at least equal to the load's moment (load weight × load center). If the load's moment wins, the combined center of gravity leaves the triangle and the truck tips.

    Source: OSHA 1910.178 App A — Balance of momentsReport a problem with this question

22. 22. The safest way to travel with a bulky load that blocks forward vision is to:

    • A.Speed up to shorten the trip
    • B.Travel in reverse (load trailing) while keeping the load low and tilted back✓ Answer
    • C.Have a coworker ride on the forks to guide
    • D.Raise the load high to see under it

    OSHA 1910.178(n)(6) requires that when a load obstructs the view, the operator travel with the load trailing (in reverse). Keeping the load low and tilted back preserves stability by holding the combined center of gravity low and inside the stability triangle.

    Source: OSHA 1910.178(n)(6); App AReport a problem with this question

Practice questions modeled on the OSHA Powered Industrial Trucks standard (29 CFR 1910.178). Not affiliated with or endorsed by OSHA. Passing this practice test does not certify you to operate a forklift — federal law requires your employer to provide formal training and a hands-on evaluation. Always follow OSHA rules and your workplace procedures. Study the official standard at osha.gov. OSHA standard →