M1 Flashcards
V=
(No s)
V= U +AT
V2 =?
V2 = U2 + 2AS
S=
(U and acceleration)
= ut + 1/2at2
S=
(V and acceleration)
= vt - 1/2at2
S =
(No acceleration)
= (u+v)/2 * t
Fmax=
μ*R
Impulse =
m(v-u)
Conservation of momentum =
M1U + M2U = M1V + M2V
(Resultant) Force =
Mass x acceleration
Impulse exerted on Q by P, use ……..’s mass/speed
Q
Impulse exerted on Q by P means what for P
Impulse on Q = -Impulse of P
When doing collision questions like impact and conservation of momentum need to consider what?
DIRECTION, PICK A POSITIVE WAY
If a block is vertically falling on another, can use what?
Conservation of momentum, not just a horizontal thing
Explain how you used …… being modelled as a particle (beam questions)
Weight acts as a point
If solving for T, in velocity time graphs
Need distances as simultaneous equations
If needing distance and have a velocity time graphs
Distance = area under graph
If drawing acceleration time graph where something has 0 acceleration
Draw dotted axis for part doesn’t have 0 acc. Then normal line for when it does
When using forces and given mass don’t forget….
G
With long marker resolving forces questions (often with pulleys or connected particles)
- F = μR
- Write any trig ratios given
- Pick one point and solve for R (remember to resolve weight and other forces)
- Solve for T
- Use T (as is same) at other point to solve for other point’s thing
Explain how you used the fact the beam is a rod…
It doesn’t bend and remains rigid
If a projection question where 2 particles are thrown and collide and asked to find ANYTHING relating to time
The particle thrown 1st will always be [time taken to reach top] + [t] where t is the time for the second one
Triangle forces questions
1. Find tension
2. Normal reaction
3. Value of tan B
- Tension is OPPOSITE WAY TO WTV THE PARTICLE IS, usually = weight in terms of m and g are usually fine
-> resolve the tension though as is a triangle - Normal reaction equal to downward force, check if tension is up or down here and then also weight
-> resolve tension or other forces - Given F= μR (some part of it)
If on point of moving towards each other F = Tension resolved
Tension = μR (substitute know things in)
Then should End up with a sin B and a cos B, manipulate to get tan
If graph question tells u to prove Some random expression with T in it
Find a point where distances or smt is equal - usually distances
Then find the distance for each in terms of T
Set equal and solve to get the weird expression
Determine whether B reaches the pulley
- B will move A’s distance from the ground = distance one
- Find speed of A when it’s about to hit the ground
- Consider which forces will make B continue to move F = ma (usually acceleration)
- Find additional distance moved (using the speed A before ground and found acceleration)
If thrown from a point of …m off the ground
1. Height used when calculating speed/time wtv at height less than original height
2. Returning back down from peak
- -ve displacement
- Max height + N
Velocity time graph for object falling
1.Starts at initial speed given
2. At peak will reach 0
3. GOES BELOW THE GRAPH and is a vector so has direction so pick a positive way
When squaring a root in calculator
put brackets around it! Otherwise it won’t be correct!
If force applied (P) keeps object in equilibrium find:
1. Minimum force P
2. Maximum force P
-> Resolve perpendicular to find R and use this to calculate Fmax
-> Resolve parallel where:
1. P-Friction
2. P + Friction
What is the scenario when force keeping something in equilibrium is the minimum value
Object is on point sliding down, friction helps force!
What is the scenario when the force applied to keep in equilibrium is at its max
When the thing is on the point of sliding up! Friction works AGAINST force!
Find max height reached by P given does not reach the pulley
- Find distance travelled by Q (other particle) before hitting floor/stopping
- Find V of Q before hitting floor (u, a, t)
- Find extra distance travelled by P as moves freely under gravity
- initial height + Q’s travelling distance + Extra height as moves freely
How does tension act in a rope between 2 things (connected particles and pulleys)
Acts in opposite directions towards each other []——>——<——[]
For connected particles, the part not being moved by an engine is moved by what force
TENSION
