

Session	100'	90'	80'	70'	60'	50'	40'
Jun-13	68	62.0	56	50	44	38	32
Jan-13	75	69.5	64	57	51	45	39
Jun-12	75	70.5	66	59	52	45	39
Jan-12	75	69.0	63	56	49	43	37
Jun-11	75	67.5	60	52	44	37	30
Jan-11	75	69.5	64	57	50	43	37
Jun-10	75	68.0	61	53	45	37	29
Jan-10	75	68.0	61	53	45	38	31
Jun-09	73	64.0	55	46	38	30	22
Jan-09	63	56.0	49	42	35	28	21
Jun-08	73	65.0	57	49	41	33	25
Jan-08	74	66.0	58	50	42	35	28
Jun-07	75	70.5	66	57	48	39	30
Jan-07	75	68.5	62	54	46	38	30
Jun-06	75	71.0	67	58	49	41	33
Jan-06	70	62.0	54	46	39	32	25
Jun-05	75	69.0	63	54	46	38	30
Jan-05	75	68.5	62	54	47	40	33
Nov-04	72	65.0	58	51	44	37	31
Jun-04	75	68.5	62	52	42	32	23
Jan-04	73	66.0	59	52	45	38	32
Nov-03	75	67.0	59	51	44	37	30
Jun-03	75	69.0	63	55	47	39	32
Jan-03	75	68.5	62	54	46	39	32
Nov-02	74	67.0	60	53	46	39	32
Jun-02	67	59.0	51	43	36	29	22
Jan-02	75	69.0	63	56	49	42	35
Jun-01	68	61.0	54	47	40	33	26
Jan-01	75	71.0	67	59	51	43	36

Reply 15

Arsey

Some Hints and Tips

LEAVE EVERY ANSWER TO 3SF

you will lose a mark if you write down a more exact answer in a question involving gravity because you will be using a rounded value of g (9.8 to 2sf). The exam board will accept 3sf as it is standard and g = 9.806 so 3sf answers are normally still correct.

LEARN YOUR ASSUMPTIONS

Rod - Plank will act in a straight line
Uniform - Weight acts at the centre
Particle - Weight acts at a single point (normally end of a rod)
Light - no extra weight added to system, same tension
Smooth pulley - same tension either side
Inextensible - same acceleration in both systems

Things you often ignore in a model

air resistant
constant coefficient of friction
constant acceleration

FORCE ACTING ON PULLEY (INCLINED PLANE)

Just learn this formula, it always works.... plane inclined at angle A to the horizontal

RF = 2T x Cos ( (90-A)/2 )

LEARN ABOUT WEIGHT

Weight = mass x gravity

if mass is given x by g. If weight is given DON'T x by g.

Weight perp to plane = mg cos A
Weight parallel to plane = mg sin A

if A = 30

Weight perp to plane = 0.866mg
Weight parallel to plane = 0.5mg

IMPULSE

Don't bother learning mv-mu or whatever it is. In M1 you are ONLY ever asked for the magnitude of impulse.

Impulse = Change in Momentum, the difference between initial and final momentum.

Impulse measured in Ns.

VECTORS

Use your common sense, if necessary draw out the problem on a coordinate grid.

Vel = change in pos / time

acc = change in vel / time

postion at any time = initial pos + t x vel

vel at any time = initial vel + t x acc

THRUST

Go over the Thrust question from June 09, I think we'll see another thrust question tomorrow.

Tension is a pulling force, tensions will point towards each other in a connecting object

Thrust is a pushing force, thrusts will point away from one another in a rigid connecting object

STATICS / DYNAMICS

Understand the difference between the two

Look for moving at constant speed, this means acc = 0, hence the resultant force is zero (equilibrium).

RF = mass x acc

MOMENTS

Don't forget the basic equation that RF vertically = 0

so all the sum of all the forces up must equal the sum of all the forces down

RESOLVING FORCES

When splitting up a force into its components, if you ClOSe the angle it is F x cos A

Inexstensible string -> accelerations are the same
Light String -> Tensions are the same