Single Skid

Safe Employment Of Ladders In The UK: The Importance Of Safety Examinations

Every Person who employs ladders in the UK should know how to execute a simple safe practices examination before employing one. Such an assessment may help to avoid falls as well as other types of injuries. Here's some data concerning what to expect when doing a ladder safety check. If your ladder will not pass the safety inspection, it ought to be eliminated from service quickly and clearly marked "Do not use."

General Considerations

Steps and treads that move about or shake may be hazardous. Take a look at and tighten any unfastened nails, bolts or screws. Are the metal pieces of the ladder free from decay or tarnishing? Examine uprights and braces for cracks, splits, breaks or slivers. In case the ladder has a non-slip base, be confident it isn't damaged or damaged. The identical fact is accurate of non-slip rungs on stepladders. The side rails ought to be totally in one piece, without any breaks, bends or cracks. In addition, be certain that the ladder, especially the treads or rungs, is unstained from grease, oil or other slippery substances. Make sure that the rungs or steps are fitted snugly into the side rails.

Additional Facts of Ladder Inspection

Before implementing a stepladder, make sure it isn't shaky. Put it up only on a sturdy, solid area. Check the hinge spreaders to ensure that they definitely are not loose or bent and that the stop on the hinge spreaders is not broken. Examine each step for breaks, gashes or a lot of worn places. On extension ladders, examine for loose, broken or absent extension locks or for locks that seat unsuitably while the ladder is extended. Observe ropes on an extension ladder for corrosion or damage. Be confident that a ladder's movable parts run efficiently free of rubbing, binding or extreme looseness.

Protective Ladder Practices

Consistently select a ladder that has the appropriate length and load rating for the job at hand. In no way use metal ladders near electrical sources. Don't use a ladder like a platform or scaffold, brace, lift or plank. For no reason tie ladders together in an attempt to make them longer and by no means utilise an unfolded stepladder as a straight ladder. In no way put ladders on unstable bases such as boxes or barrels to get additional height. Employ both hands whilst going up or descending a ladder and keep your body centred in the middle of the stiles. By no means position yourself on the top three steps of a ladder.

Additional Security Tips

Do not over stretch. This may possibly trigger you to lose your balance. Relocate the ladder instead. Do not carry very weighty loads up or down a ladder. Be positive the ladder has non-slip feet to prevent it from sliding on a level, tough surface area. If positioning a tall ladder, space the base 1 foot away from the wall for every 4 feet in height. A roof ladder should extend 3 ft over it. Be positive to engage both locks on an extension ladder. Wood ladders shouldn't be painted due to the fact that paint could cover up damages. Utilise varnish, shellac or linseed oil In its place.

Paying attention to ladder safety methods is vitally significant for construction workers, skilled labourers and DIY-ers all over the UK.

How do I solve this ridiculous physics question ?

Collision Investigation.
Vehicle 1 collided into rear of vehicle 2. The vehicles were found locked together at the end of a double set of skidmarks.

DATA:
Mass of vehicle one - 2500kg
mass of vehicle two - 1500kg

length of single skid marks - 17.5m
length of double skidmarks - 5.5m

Coefficient fiction of road - 0.7
speed limit - 50mph

determine if vehicle one was breaking the speed limit when he first applied the brakes for an emergency stop.

analysis
1)analysis of the motion of the locked vehicles after impact (I really dont know about his one, decelleration maybe?)
2) conversation of momentum at impact
3) analysis of the motion of vehicle one during emergency braking ( speed?)

thankyou for any help you can give
I really dont know wher eI m going with the question

given;
V1 = 50 mph = 22.32 m/s
M1 = 2500 kg
M2 = 1500 kg
S1 = 17.5 m
S2 = 5.5 m
µ = 0.7

all questions of 1), 2) and 3) will be solved in explanation below.
I assume that vehicle #1 initial speed is V1.
Length of single skid marks is S1, and will be applied by conservation of energy.

And now for vehicle #1 speed analysis during breaking time.
Energy before vehicle #1 breaking = energy of instantaneous before collision.

½ M1 V1² = ½ M1 (V1*)² + µ M1 g S1

(V1*)² = ½ V1² - µ g S1

(V1*)² = ½ (22.32)² - 0.7 (9.8) (17.5)

V1* = 11.36 m/s

V1* is vehicle #1 speed before collision

After collision, the converse of energy still valid to applied. So, the analysis of the motion of vehicle #1 and vehicle #2 during emergency braking until they stop is:

½ (M1+ M2) (V_after)² = ½ (M1+ M2)(0)² + µ (M1+ M2) g S2

(V_after)² = 2 µ g S2

(V_after)² = 2 (0.7)(9.8) (5.5)

V_after = 8.687 m/s

V_after is speed of both vehicles after collision.

base on converse of momentum during collision,:

momentum vehicle #1 before collision + momentum vehicle #2 before collision = momentum vehicle #1 and #2 after collision.

M1 V1* + M2 V2* = (M1 + M2) V_after

V2* = {(M1 + M2) V_after - M1 V1*}/M2

V2* = {(2500 + 1500) 8.687 - (2500)(11.36)}/1500

V2* = +4.232 m/s

V2* is speed of vehicle #2 before collision. Positive its mean same direction with vehicle #1 before collision

Kentucky-Louisville rivalry takes center stage (St. Petersburg Times)

**Times wires**

Friday, December 30, 2011

LEXINGTON, Ky. -- Kentucky coach John Calipari began a list when he was asked
whether he and Louisville coach Rick Pitino are too much alike to get along.

"Similarities? We've both taken three teams to the Final Four, we both got
fired in the NBA and we're Italians with big noses," Calipari said Friday. "I
respect what he's done, respect the program, respect the city and the school."

No. 3 Kentucky (12-1) and No. 4 Louisville (12-1) renew their rivalry in the
most anticipated yearly game in the Commonwealth today at Rupp Arena (noon,
Ch. 10)

This time, the two schools have the highest combined ranking in series
history. But Kentucky freshman Anthony Davis said he has recognized the
passion simply by the amount of tweets he has received from fans about beating
Louisville.

"We guess it's a big deal for them," Davis said.

Louisville has been quiet since its 20-game home winning streak ended in a
71-68 loss to No. 12 Georgetown on Wednesday. The Cardinals have lost the last
two in the series.

"I think Kentucky is the better basketball team right now," Pitino said after
the loss to the Hoyas. ...

St. Petersburg Times

horse logging doing a single skid